01 What makes it unique
Alliance RV lists the 2027 Delta Solo ML166 at 4,148 lb dry, a GVWR of 5,650 lb and a tongue weight of 510 lb. Alliance RV prints no cargo carrying capacity for it, so none is given here; the federal label inside the trailer carries one.
It is 19' 11" long. Alliance RV prints its tanks as 45 gal fresh, 45 gal grey, 37 gal black.
Among the 19 Alliance RV Delta floorplans Alliance RV’s 2027 Delta brochure lists with a published dry weight, it is number 2 from the lightest, in a range from 3,990 lb (Delta Solo RB152) to 8,253 lb (Delta 321BH). Every figure in that comparison is Alliance RV’s, for the same model year.
Every number on this page was read on 5 Nov 2026 from Alliance RV’s 2027 Delta brochure, the maker’s own dated document for model year 2027.
How the ML166 differs from the other seven Alliance RV Delta floorplans. Most distinctive first. How these ranks are worked out.
- Dry weight, 4,148 lb: lightest of eight; next is the ML216 (5,372 lb).
- GVWR, 5,650 lb: lowest of seven; next is the ML216 (7,450 lb).
- Tongue weight, 510 lb: lightest of seven; next is the ML216 (589 lb).
- Length, 19 ft 11 in: shortest of eight; next is the ML216 (25 ft 11 in).
- Black tank, 37 gal: smallest of eight; next are the 258FK, 2713 and five others (45 gal).
- Tongue weight as a share of dry weight, 12.3%: second-largest of seven, between the LK254 (11.6%) and the 2713 (14.8%).
- Grey tank, 45 gal: smallest of eight, level with the ML216; next are the BH255, LK254 and RE250 (82 gal).
Next to the ML216, the nearest heavier floorplan by dry weight, the ML166 is 1,224 lb lighter by dry weight, has a GVWR 1,800 lb lower, has a tongue weight 79 lb lighter, is 6 ft shorter and has a black tank 8 gal smaller; the two publish the same fresh tank and grey tank.
02 Full specifications
Dimensions
- Exterior length
- 19' 11"
- Exterior height
- Not published by Alliance RV
- Exterior width
- Not published by Alliance RV
- Interior height
- Not published by Alliance RV
Weights
- Dry / unit base weight (UVW)
- 4,148 lb
- GVWR (max loaded)
- 5,650 lb
- Net cargo / payload (CCC)
- Not published by Alliance RV
- Hitch / tongue weight
- 510 lb
Capacities
- Fresh water
- 45 gal
- Grey water
- 45 gal
- Black water
- 37 gal
Running gear
- Hitch type
- Bumper pull
- Tire size
- Not published by Alliance RV
Sleeping & layout
- Sleeps
- Not published by Alliance RV
How these published figures sit against the rest of the catalogue: travel trailer tongue weight by size; fresh, grey and black tank sizes; camper trailer size chart.
Towing it
Check your vehicle. Enter the ratings from your owner’s manual and the door-pillar placard.
Compares your figures with this page’s published GVWR (5,650 lb) and the upper loaded tongue estimate (848 lb, a rule of thumb). Your vehicle’s placard and the trailer’s own weight label govern.
Loaded range: 10–15% of GVWR on the tongue, a rule of thumb, not a measurement of this unit. No truck ratings or hitch classes (why; NHTSA, DOT HS 809 433).
03 The Alliance RV Delta floorplan family
Alliance RV’s 2027 Delta brochure lists 20 Alliance RV Delta floorplans; every one with a printed weight has a page here (the floorplans already on this site keep their 2026 pages and 2026 figures).
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| Delta Solo RB152 | 19' 11" | — | Profiled |
| Delta Solo ML166 | 19' 11" | — | Profiled |
| Delta Solo BH181 | 22' 11" | — | Profiled |
| Delta Ultra Lite ML206 | 23' 11" | — | Profiled |
| Delta Ultra Lite ML216 | 25' 11" | — | Profiled |
| Delta Ultra Lite RK234 | 27' 11" | — | Profiled |
| Delta Ultra Lite LK254 | 29' 11" | — | Profiled |
| Delta Ultra Lite RE250 | 29' 11" | — | Profiled |
| Delta Ultra Lite BH255 | 29' 11" | — | Profiled |
| Delta 262RB | 29' 7" | — | Profiled |
| Delta X 2713 | 31' 11" | — | Profiled |
| Delta 252RL | 29' 11" | — | Profiled |
| Delta 258FK | 29' 11" | — | Profiled |
| Delta 281BH | 31' 11" | — | Profiled |
| Delta 291BH | 33' 11" | — | Profiled |
| Delta 274RKW | 31' 11" | — | Profiled |
| Delta 292RL | 33' 11" | — | Profiled |
| Delta 284RK | 32' 11" | — | Profiled |
| Delta 321BH | 36' 11" | — | Profiled |
| Delta Ultra Lite FK218 | 25' 11" | — | Catalogued · Alliance prints its figures as TBD |
Alliance RV’s 2027 Delta brochure lists 20 Alliance RV Delta floorplans. Every one with a printed weight has a page here (the floorplans already on this site keep their 2026 pages and 2026 figures).
04 Notes on this floorplan
What Alliance RV does not publish for the Delta Solo ML166
Alliance RV prints no cargo carrying capacity, tire size, interior height, sleeping capacity for this model, so none is given. Nothing is filled from a sibling model, a different model year or a dealer listing.
Read the label on the trailer
Federal rules put a load-carrying label inside every RV trailer: its unloaded weight with full propane, its cargo carrying capacity and its GVWR (49 CFR 571.110 and 571.120). Those figures come from the trailer itself and govern the towing decision.
05 How it compares
3,990 lb dry and 4,850 lb GVWR, against this model’s 4,148 lb and 5,650 lb.
4,582 lb dry and 5,650 lb GVWR, against this model’s 4,148 lb and 5,650 lb.
07 Where this floorplan sits
Closest sibling: the Alliance RV Delta Delta Ultra Lite ML216, nearest on the published figures. It differs on 5 of the 7 fields both publish (this plan first): length 19 ft 11 in vs 25 ft 11 in; dry weight 4,148 lb vs 5,372 lb; GVWR 5,650 lb vs 7,450 lb; hitch weight 510 lb vs 589 lb; black tank 37 gal vs 45 gal. They match on fresh tank and grey tank.
| Alliance RV Delta plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 5,650 | 1 of 7 | 5,650–10,450 |
| Dry weight (lb) | 4,148 | 1 of 8 | 4,148–7,536 |
| Hitch weight (lb) | 510 | 1 of 7 | 510–958 |
| Length | 19 ft 11 in | 1 of 8 | 19 ft 11 in–32 ft 11 in |
| Grey tank (gal) | 45 | 1–2 of 8 | 45–90 |
| Black tank (gal) | 37 | 1 of 8 | 37–45 |
Either side of it by GVWR: Alliance RV Delta Delta Ultra Lite ML216 is 1,800 lb heavier (7,450 lb GVWR).
| Nearest Alliance RV Delta siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Alliance RV Delta Delta Solo ML166 | 19 ft 11 in | — | 4,148 | 5,650 | — | 510 | 45 |
| Alliance RV Delta Delta Ultra Lite ML216 | 25 ft 11 in | — | 5,372 | 7,450 | — | 589 | 45 |
| Alliance RV Delta Delta Ultra Lite BH255 | 29 ft 11 in | — | 6,190 | 8,450 | — | 670 | 45 |
| Alliance RV Delta Delta Ultra Lite RE250 | 29 ft 11 in | — | 6,175 | 8,450 | — | 675 | 45 |
| Alliance RV Delta Delta Ultra Lite LK254 | 29 ft 11 in | — | 6,017 | 8,450 | — | 696 | 45 |
| Alliance RV Delta Delta 258FK | 29 ft 11 in | — | 6,608 | — | — | — | 45 |
All 8 Alliance RV Delta floorplans: Alliance RV Delta line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Delta Solo ML166 | 5,650 | 4,148 | — | 19 ft 11 in |
| EVO 165VW | 5,650 | 4,437 | — | 23 ft 2 in |
| Surveyor Legend 19RBLE | 5,649 | 3,917 | — | 23 ft 7 in |
| Ozark 1680BSK | 5,655 | 4,269 | — | 23 ft 2 in |
| Aurora Light 18BHSX | 5,656 | 4,183 | — | 23 ft 1 in |
| Wildcat 181DBEDS | 5,630 | 4,217 | — | 22 ft 11 in |
| Campsite Reserve 17LS | 5,625 | 4,304 | — | 23 ft 10 in |
Against the Delta Solo ML166: the EVO 165VW is 3 ft longer; the Surveyor Legend 19RBLE is 1 lb lighter and 4 ft longer; the Ozark 1680BSK is 5 lb heavier and 3 ft longer.
08 Common questions about the Delta Solo ML166
How much does the Delta Solo ML166 weigh?
4,148 lb dry; 5,650 lb GVWR, the most it may weigh loaded.
What is the tongue weight of the Delta Solo ML166?
510 lb as published, 12% of the dry weight (median across 1,413 travel trailers here: 12%).
What size tow vehicle does the Delta Solo ML166 need?
A tow rating of at least 5,650 lb, plus payload for the loaded tongue weight, passengers and cargo.
What are the tank capacities on the Delta Solo ML166?
Fresh 45, grey 45, black 37 gallons. Off hookups, fresh water runs out first.
How long is the Delta Solo ML166?
19' 11" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
7 of the 18 fields this catalogue tracks are published for the Delta Solo ML166. Not published: cargo capacity (CCC), exterior height, exterior width, interior height, sleeps, slide count, axle count, tire specification, awning, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: alliancerv.com, library.rvusa.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 1 recall campaign and 2 owner complaints (model years 2005 on) against the Delta line (a recall and a complaint are not the same thing).
Too few reports to show a pattern. 2 complaints have been filed on this line — not enough to say what fails most often. They cover equipment and unknown or other.
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 Delta line page.