01 What makes it unique
The 388SP is the newest and most expensive Paradigm, introduced for 2026 around an ‘SP’ side patio: a wall panel off the living area folds down into an outdoor deck with railing, opening the coach to the outside in a way no other Paradigm does. It sleeps four on three slide-outs, with a king suite and the full Paradigm equipment package — a Lusso range with a 12,000-BTU burner and a 3.73-cubic-foot oven, a 19-cubic-foot 12-volt residential refrigerator and a fireplace — on the Benchmark 101-inch wide-body drop-frame chassis with Curt 8,000-pound axles, self-adjusting brakes and six-point hydraulic leveling.
Alliance publishes a 19,000-pound GVWR against the 15,528-pound dry weight — the heaviest dry weight in the line — leaving a 3,472-pound cargo capacity and a 3,112-pound dry pin, the highest pin in the Paradigm range. Three roof air conditioners totalling 40,500 BTU, a 40,000-BTU furnace, a 12-gallon gas/electric water heater, an enclosed and heated underbelly and 98/106/53-gallon fresh/grey/black tanks are standard. At a starting MSRP around $153,000 it is the priciest Paradigm, with street pricing below placard. For buyers who want an integrated outdoor patio deck on a luxury full-profile coach and tow with a one-ton truck, the 388SP is the 2026 flagship.
02 Full specifications
Dimensions
- Exterior length
- 40' 11"
- Exterior width
- 101" (wide-body chassis)
- Exterior height
- 13' 5"
- Chassis
- Benchmark 101" wide-body drop-frame
Weights
- Dry / unit base weight (UVW)
- 15,528 lbs
- GVWR (max loaded)
- 19,000 lbs
- Net cargo / payload (CCC)
- 3,472 lbs
- Dry pin (hitch) weight
- 3,112 lbs
Capacities
- Fresh water
- 98 gal
- Grey water
- 106 gal
- Black water
- 53 gal
- Refrigerator
- 19 cu ft
Construction
- Chassis
- Benchmark 101" wide-body drop-frame
- Suspension
- TCS Touring Coil Suspension · MorRyde 8K independent disc available
- Walls
- Azdel-backed high-gloss fiberglass · insulated laminated rear wall
- Roof
- Walkable PVC membrane · roof ladder · access ports
- Underbelly
- Enclosed & heated tanks · heated low-point drains
Running gear
- Axles
- 2 (Curt 8,000 lb)
- Hitch
- Fifth-wheel (in-bed) · Helux coil-spring pin box · 2" accessory receiver
- Brakes
- Self-adjusting · MorRyde 8K independent disc option
- Tires
- H-rated · Counteract balancing beads · 16" spare
Galley & bath
- Cooktop
- Lusso range · 12,000-BTU burner · 3.73 cu ft oven
- Refrigerator
- 19 cu ft
- A/C
- 3 units · 40,500 BTU
- Water heater
- 12-gal gas / electric
Sleeping & layout
- Sleeps
- 4
- Slides
- 3
- Entries
- 1
- Awnings
- 2
- Primary bed
- King
Drawn to scale
Weight budget
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
Towing it
Loaded range: 15–25% of GVWR on the pin, a rule of thumb, not a measurement of this unit. No truck ratings or hitch classes (why; NHTSA, DOT HS 809 433). The range starts at the published dry figure, because loaded is never lighter than dry.
03 The Paradigm floorplan family
Paradigm is Alliance RV's luxury full-profile fifth wheel — the company's flagship since 2019 and a cross-shop against Grand Design's Solitude, Keystone's Montana and Jayco's Pinnacle. The 2026 line runs to ten floorplans; the six profiled in full are linked below and the four catalogued plans are shown muted. The 388SP on this page is highlighted.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 295MK | 33 ft | 4 | Mid kitchen, rear living, shortest in line |
| 310RL | 34 ft | 4 | Rear living great room, walk-around island |
| 312RK | 34 ft | 4 | Rear kitchen |
| 340RL | 37 ft | 4 | Rear living |
| 370FB | 40 ft | 4 | Front bath |
| 388SP | 40 ft | 4 | Side patio, new for 2026, flagship |
| 385FL | 41 ft | 6 | Front living, loft, sleeps six |
| 382RK | 41 ft | 6 | Rear kitchen, sleeps six |
| 375RD | 41 ft | 5 | Rear den, five slides (namesake plan) |
| 395DS | 42 ft | 7 | Sleeps 7 (largest catalogued) |
Paradigm has been Alliance RV's luxury full-profile fifth wheel and its flagship since the company's founding in 2019. The 2026 line runs to ten floorplans; the six broadest-appeal layouts are profiled here in full and the remaining four are catalogued from published specifications below. Every Paradigm rides the Benchmark 101-inch wide-body drop-frame chassis on Curt 8,000-pound axles with self-adjusting brakes, H-rated tires and a Helux coil-spring pin box, with six-point hydraulic leveling, an enclosed and heated underbelly, a walkable PVC roof, a 19-cubic-foot 12-volt residential refrigerator, three roof air conditioners totalling 40,500 BTU, a 40,000-BTU furnace, a 12-gallon gas/electric water heater and a Lusso range as standard; a MorRyde 8K independent suspension with disc brakes is available. Hitch weight, GVWR, dry weight and CCC are published per plan and each plan's dry weight plus CCC equals its GVWR exactly. Dry weight is a factory estimate; real loaded pin weights run higher — always weigh the loaded coach and confirm against your truck's payload and rear-axle ratings.
04 Notes on this floorplan
Side patio deck (new for 2026)
An ‘SP’ wall panel folds down into a railed outdoor deck off the living area — unique in the Paradigm line and new for 2026.
Priciest, heaviest Paradigm
The highest MSRP and heaviest dry weight in the line, with the highest 3,112-pound pin.
Full luxury equipment
Carries the complete Paradigm standard package — Lusso range, 19-cu-ft 12V fridge, king suite, six-point leveling.
Wants a one-ton truck
At a 19,000-pound GVWR and a 3,112-pound pin, confirm a properly rated one-ton truck’s payload and rear-axle rating.
05 How it compares
Grand Design’s luxury Solitude — a full-profile luxury-5W cross-shop at the top of the class.
Brinkley’s luxury fifth wheel — a modern independent-maker cross-shop with outdoor-focused layouts.
The front-living 385FL — lighter, five slides and a front great room instead of a side patio.
06 Loading it for a trip
A full 98-gallon fresh tank is about 817 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 24% of the 388SP’s 3,472 lb cargo capacity, leaving 2,655 lb (664 lb per rated berth). Across 6 Paradigm floorplans the water share runs 23% to 27%, and 4 give up more than this one. Nearest on that share: Paradigm 385FL at 23% and Paradigm 295MK at 24%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).
07 Where this floorplan sits
Closest sibling: the Paradigm 385FL, nearest on the published figures. It differs on 5 of the 9 fields both publish (this plan first): length 40 ft 11 in vs 41 ft 4 in; sleeps 4 vs 6; dry weight 15,528 lb vs 15,487 lb; cargo capacity 3,472 lb vs 3,513 lb; dry hitch weight 3,112 lb vs 2,957 lb. They match on GVWR, fresh tank, grey tank and black tank.
| Paradigm plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 19,000 | 5–6 of 6 | 16,000–19,000 |
| Dry weight (lb) | 15,528 | 6 of 6 | 12,567–15,528 |
| Cargo capacity (lb) | 3,472 | 5 of 6 | 3,008–3,513 |
| Dry hitch weight (lb) | 3,112 | 6 of 6 | 2,350–3,112 |
| Length | 40 ft 11 in | 3 of 6 | 33 ft 3 in–41 ft 9 in |
| Black tank (gal) | 53 | 1–5 of 6 | 53–106 |
| Sleeps | 4 | 1–3 of 6 | 4–6 |
Either side of it by GVWR: Paradigm 385FL matches it at 19,000 lb GVWR.
| Nearest Paradigm siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Paradigm 388SP | 40 ft 11 in | 4 | 15,528 | 19,000 | 3,472 | 3,112 | 98 |
| Paradigm 385FL | 41 ft 4 in | 6 | 15,487 | 19,000 | 3,513 | 2,957 | 98 |
| Paradigm 375RD | 41 ft 9 in | 5 | 14,771 | 18,000 | 3,229 | 2,875 | 98 |
| Paradigm 310RL | 34 ft 11 in | 4 | 12,992 | 16,000 | 3,008 | 2,530 | 98 |
| Paradigm 295MK | 33 ft 3 in | 4 | 12,567 | 16,000 | 3,433 | 2,350 | 98 |
| Paradigm 382RK | 41 ft 6 in | 6 | 14,577 | 18,000 | 3,423 | 2,951 | 98 |
All 6 Paradigm floorplans: Paradigm line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 388SP | 19,000 | 15,528 | 4 | 40 ft 11 in |
| Influence 3804DS | 19,000 | 14,603 | 6 | 42 ft 6 in |
| Momentum 344M | 19,000 | 15,910 | 6 | 39 ft 11 in |
| Solitude 310GK | 19,000 | 12,100 | 4 | 34 ft 4 in |
| Seismic 3512 | 18,995 | 14,285 | 7 | 41 ft 7 in |
| Riverstone 39RKFB | 18,975 | 16,511 | 4 | 42 ft 1 in |
| Bighorn 40DB | 18,850 | 16,110 | 8 | 43 ft 10 in |
Against the 388SP: the Influence 3804DS is 2 ft longer and sleeps 2 more; the Momentum 344M is 1 ft shorter and sleeps 2 more; the Solitude 310GK is 7 ft shorter.
08 Common questions about the 388SP
How much does the 388SP weigh?
15,528 lb dry; 19,000 lb GVWR, the most it may weigh loaded.
How much can the 388SP carry?
3,472 lb, 18% of its GVWR (median across 307 fifth wheels here: 19%). A full fresh tank uses 817 lb of it.
What is the pin weight of the 388SP?
3,112 lb dry, 20% of the dry weight (median across 386 fifth wheels here: 19%).
What size tow vehicle does the 388SP need?
A tow rating of at least 19,000 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the 388SP sleep?
It is rated to sleep 4. 3 of the 6 Paradigm floorplans that publish a count sleep more.
What are the tank capacities on the 388SP?
Fresh 98, grey 106, black 53 gallons. Off hookups, fresh water runs out first.
How long is the 388SP?
40' 11" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
17 of the 18 fields this catalogue tracks are published for the 388SP. Not published: interior height, tire size (a description is published, a size is not).
Sourcing rules: methodology.
10 Manuals & documents
Sources: alliancerv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 10 recall campaigns and 10 owner complaints against the Paradigm line. They are counted separately: a recall is a confirmed defect with a remedy, a complaint one owner’s unverified account.
What to look at on a used one. Across the 10 complaints filed on this line the most-reported components are wheels (30%), equipment (20%) and structure (20%).
Recall coverage here is not complete, and complaints are owners’ unverified reports (how this record is built). Check a specific VIN at NHTSA before you buy. Full tables are on the Paradigm line page.