01 What makes it unique
The 3503GK is the 3203GK’s rear-galley-kitchen format opened out for more room: a residential kitchen across the rear wall, a private front bedroom and a fireplace, stretched to about 38 feet on three slide-outs, sleeping four. The extra length goes into living space around the same couples’ layout. The equipment is the standard Influence package — a 16-cubic-foot 12-volt refrigerator, gel-coat sidewalls and the 330-watt Influence Solar Package — on the 101-inch wide-body platform inside a five-sided welded-aluminum cage, under a walk-on Thermal Roof, with a fully enclosed, heated underbelly.
Grand Design publishes a 16,800-pound GVWR against the 13,868-pound dry weight, leaving a 2,932-pound cargo capacity and a 2,670-pound dry pin. A single 15,000-BTU air conditioner and 81/106/53-gallon fresh/grey/black tanks are standard, with six-point auto-leveling available. At a starting MSRP around $116,247, with street pricing below placard, the 3503GK is the Influence for a couple who wants the rear-galley layout with more length and living space, towed with a properly rated three-quarter-ton or one-ton truck.
02 Full specifications
Dimensions
- Exterior length
- 38' 3"
- Exterior width
- 8' 5" (101″ wide-body)
- Exterior height
- 13' 5"
- Chassis
- 101″ wide-body · welded-aluminum five-sided cage
Weights
- Dry / unit base weight (UVW)
- 13,868 lbs
- GVWR (max loaded)
- 16,800 lbs
- Net cargo / payload (CCC)
- 2,932 lbs
- Dry pin (hitch) weight
- 2,670 lbs
Capacities
- Fresh water
- 81 gal
- Grey water
- 106 gal
- Black water
- 53 gal
- Refrigerator
- 16 cu ft 12V
Construction
- Body cage
- Five-sided welded-aluminum cage
- Roof
- Walk-on · Thermal Roof R-40 (fiberglass + radiant foil, vented attic)
- Walls
- Fully laminated R-11 · welded-aluminum framed, rigid foam
- Main floor
- Triple-insulated R-45 (radiant foil + fiberglass)
- Underbelly
- Fully enclosed & heated (all-weather) · heated tanks
- Exterior
- Gel-coat sidewalls
Running gear
- Axles
- 2 (tandem)
- Hitch
- Fifth-wheel (in-bed) pin box
- Solar
- Influence Solar Package · 330W panel, controller, inverter prep
- Leveling
- 6-point hydraulic auto-leveling (optional)
Galley & systems
- Refrigerator
- 16 cu ft 12-volt residential
- Air conditioning
- 15,000 BTU
- Solar / electrical
- Influence Solar Package · 330W · inverter prep
- Water heater
- Gas / electric
Sleeping & layout
- Sleeps
- 4
- Slides
- 3
- Entries
- 1
- Awnings
- 2
- Primary bed
- Queen (king optional)
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 Influence floorplan family
Influence is Grand Design's residential-style full-profile fifth wheel on the 101-inch wide-body platform that underpins the flagship Solitude, offered at a lower entry point — a cross-shop against Keystone's Cougar and Montana, Jayco's Eagle and North Point, with the Grand Design Reflection a step below. The 2026 line runs to seven floorplans, all profiled in full and linked below. The 3503GK on this page is highlighted.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 2903RL | 34 ft | 4 | Rear living, kitchen island, front master |
| 3003RL | 34 ft | 4 | Rear living, kitchen island, big payload |
| 3203GK | 35 ft | 3 | Rear galley kitchen, private front bedroom |
| 3503GK | 38 ft | 4 | Rear galley kitchen, stretched living space |
| 3704BH | 40 ft | 8 | Private bunk room, quad slides, family |
| 3804DS | 42 ft | 6 | Two masters, two full baths, loft |
| 3904BH | 42 ft | 9 | Bunkhouse, outdoor kitchen, bath-and-a-half |
Influence is Grand Design's residential-style full-profile fifth wheel — the 101-inch wide-body platform that underpins the flagship Solitude, offered at a lower entry point. The 2026 line runs to seven floorplans, all profiled here in full. Every Influence rides the 101-inch wide-body platform inside a five-sided welded-aluminum cage, under a walk-on Thermal Roof (R-40, fiberglass and radiant foil over a vented attic), with fully laminated R-11 walls, a triple-insulated R-45 main floor and a fully enclosed, heated all-weather underbelly with heated tanks. The Influence Solar Package — a 330-watt panel with controller and inverter prep — a 16-cubic-foot 12-volt refrigerator and gel-coat sidewalls are standard, with six-point hydraulic auto-leveling and a third air conditioner with heat pump available. Dry weight, GVWR, CCC and pin are published per plan and each plan's dry weight plus CCC equals its GVWR exactly. 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
Rear galley with more length
The 3203GK rear-galley-kitchen format stretched to about 38 feet — more room in the living area around the same couples’ layout.
Private front bedroom
A private front bedroom and a fireplace, with the residential kitchen across the back wall.
Watch loaded weight
Its 2,932-pound CCC is tighter than the shorter 3203GK — plan gear and water against it.
Wants a three-quarter-ton+ truck
A 16,800-pound-GVWR full-profile fifth wheel — confirm a properly rated three-quarter-ton or one-ton truck’s payload and rear axle.
05 How it compares
Keystone’s luxury Montana — a comparable longer rear-kitchen full-profile fifth wheel.
The 3203GK — the same rear-galley format, shorter and lighter with more cargo headroom.
The flagship Solitude on the same platform — a longer, more luxurious option above the Influence.
06 Loading it for a trip
A full 81-gallon fresh tank is about 676 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 23% of the 3503GK’s 2,932 lb cargo capacity, leaving 2,256 lb (564 lb per rated berth). Across 7 Influence floorplans the water share runs 13% to 34%, and 2 give up more than this one. Nearest on that share: Influence 2903RL at 21% and Influence 3904BH at 23%. 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 Influence 2903RL, nearest on the published figures. It differs on 5 of the 9 fields both publish (this plan first): length 38 ft 3 in vs 34 ft 5 in; dry weight 13,868 lb vs 11,800 lb; GVWR 16,800 lb vs 15,000 lb; cargo capacity 2,932 lb vs 3,200 lb; dry hitch weight 2,670 lb vs 2,190 lb. They match on sleeps, fresh tank, grey tank and black tank.
| Influence plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 16,800 | 2–4 of 7 | 15,000–19,000 |
| Dry weight (lb) | 13,868 | 4 of 7 | 11,800–16,000 |
| Cargo capacity (lb) | 2,932 | 2 of 7 | 2,002–5,500 |
| Dry hitch weight (lb) | 2,670 | 4 of 7 | 2,190–2,911 |
| Length | 38 ft 3 in | 4 of 7 | 34 ft 5 in–42 ft 8 in |
| Fresh tank (gal) | 81 | 1–4 of 7 | 81–83 |
| Black tank (gal) | 53 | 1–4 of 7 | 53–106 |
| Sleeps | 4 | 2–4 of 7 | 3–9 |
Either side of it by GVWR: Influence 3203GK matches it at 16,800 lb GVWR; Influence 3704BH matches it at 16,800 lb GVWR.
| Nearest Influence siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Influence 3503GK | 38 ft 3 in | 4 | 13,868 | 16,800 | 2,932 | 2,670 | 81 |
| Influence 2903RL | 34 ft 5 in | 4 | 11,800 | 15,000 | 3,200 | 2,190 | 81 |
| Influence 3203GK | 35 ft 11 in | 3 | 12,712 | 16,800 | 4,088 | 2,471 | 81 |
| Influence 3003RL | 34 ft 11 in | 4 | 12,500 | 18,000 | 5,500 | 2,300 | 83 |
| Influence 3704BH | 40 ft 4 in | 8 | 14,798 | 16,800 | 2,002 | 2,728 | 81 |
| Influence 3904BH | 42 ft 8 in | 9 | 16,000 | 19,000 | 3,000 | 2,700 | 83 |
All 7 Influence floorplans: Influence line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 3503GK | 16,800 | 13,868 | 4 | 38 ft 3 in |
| Nightfall 350N | 16,790 | 12,319 | — | 40 ft 6 in |
| Cedar Creek 380DB | 16,815 | 15,024 | 10 | 43 ft 5 in |
| Columbus 379MBL | 16,785 | 14,664 | — | 42 ft 7 in |
| Puma Mesa 379MBL | 16,785 | 14,664 | — | 42 ft 7 in |
| Montana High Country 373RD | 16,780 | 13,399 | 8 | 41 ft 4 in |
| Wolf Pack 352PACK15 | 16,745 | 12,768 | — | 45 ft 0 in |
Against the 3503GK: the Nightfall 350N is 10 lb lighter and 2 ft longer; the Cedar Creek 380DB is 15 lb heavier and 5 ft longer and sleeps 6 more; the Columbus 379MBL is 15 lb lighter and 4 ft longer.
08 Common questions about the 3503GK
How much does the 3503GK weigh?
13,868 lb dry; 16,800 lb GVWR, the most it may weigh loaded.
How much can the 3503GK carry?
2,932 lb, 17% of its GVWR (median across 307 fifth wheels here: 19%). A full fresh tank uses 676 lb of it.
What is the pin weight of the 3503GK?
2,670 lb dry, 19% of the dry weight (median across 386 fifth wheels here: 19%).
What size tow vehicle does the 3503GK need?
A tow rating of at least 16,800 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the 3503GK sleep?
It is rated to sleep 4. 3 of the 7 Influence floorplans that publish a count sleep more.
What are the tank capacities on the 3503GK?
Fresh 81, grey 106, black 53 gallons. Off hookups, fresh water runs out first.
How long is the 3503GK?
38' 3" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
16 of the 18 fields this catalogue tracks are published for the 3503GK. Not published: interior height, tire specification.
Sourcing rules: methodology.
10 Manuals & documents
Sources: granddesignrv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
No recall campaign or owner complaint in our NHTSA data names the Influence line. Read that as no result found, not as a clean record.
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 Influence line page.