01 What makes it unique
Forest River lists the 2020 XLR Thunderbolt 422AMP at 16,364 lb dry, a net carrying capacity of 4,636 lb and a pin weight of 3,643 lb. It prints no GVWR for it.
It is 44' 6" long and 13' 4" high. Forest River prints its tanks as 158 gal fresh, 86 gal grey, 86 gal black.
Among the 5 XLR Thunderbolt floorplans Forest River’s XLR Thunderbolt brochure (filed in Forest River’s /brochures/2020/ folder; the brochure prints no year) lists with a published dry weight, it is number 5 from the lightest, in a range from 13,644 lb (XLR Thunderbolt 369AMP) to 16,364 lb (XLR Thunderbolt 422AMP). Every figure in that comparison is Forest River’s, for the same model year.
Every number on this page was read on 6 Nov 2026 from Forest River’s XLR Thunderbolt brochure (filed in Forest River’s /brochures/2020/ folder; the brochure prints no year); model year 2020 comes from where the maker files it on its own site, not from the document’s text.
How the 422AMP differs from the other four XLR Thunderbolt floorplans. Most distinctive first. How these ranks are worked out.
- Dry weight, 16,364 lb: heaviest of five; next is the 413AMP (16,280 lb).
- Cargo capacity, 4,636 lb: second-smallest of five, between the 369AMP (3,496 lb) and the 413AMP (4,720 lb).
- Pin weight, 3,643 lb: second-heaviest of five, between the 381AMP (3,335 lb) and the 382AMP (3,760 lb).
- Pin weight as a share of dry weight, 22.3%: third-smallest of five, between the 381AMP (21.6%) and the 369AMP (23%).
- Grey tank, 86 gal: third-smallest of five, between the 382AMP (80 gal) and the 381AMP (100 gal).
- Length, 44 ft 6 in: longest of five, level with the 413AMP; next is the 381AMP (44 ft).
- Black tank, 86 gal: largest of five, level with the 413AMP; next are the 381AMP and 382AMP (80 gal).
Next to the 413AMP, the nearest lighter floorplan by dry weight, the 422AMP is 84 lb heavier by dry weight, has 84 lb less cargo capacity, has a pin weight 320 lb heavier and has a grey tank 32 gal smaller; the two publish the same length, exterior height, fresh tank and black tank.
02 Full specifications
Dimensions
- Exterior length
- 44' 6"
- Exterior height
- 13' 4"
- Exterior width
- 102"
- Interior height
- Not published by Forest River
Weights
- Dry / unit base weight (UVW)
- 16,364 lb
- GVWR (max loaded)
- Not published by Forest River
- Net cargo / payload (CCC)
- 4,636 lb
- Hitch / pin weight
- 3,643 lb
Capacities
- Fresh water
- 158 gal
- Grey water
- 86 gal
- Black water
- 86 gal
Running gear
- Hitch type
- Fifth wheel (pin box)
- Tire size
- Not published by Forest River
Sleeping & layout
- Sleeps
- Not published by Forest River
- Model year source
- The brochure prints no model year; the maker files it in its own /brochures/2020/ folder.
- Tires (as printed)
- Standards list: "16” Radial Tires w/ Nitrofill™"
- Awning
- 24'
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.
Drawn to scale
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
03 The XLR Thunderbolt floorplan family
Forest River’s XLR Thunderbolt brochure (filed in Forest River’s /brochures/2020/ folder; the brochure prints no year) lists 5 XLR Thunderbolt floorplans; every one with a printed weight has a page here.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| XLR Thunderbolt 369AMP | 39' 10" | — | Profiled |
| XLR Thunderbolt 381AMP | 44' 0" | — | Profiled |
| XLR Thunderbolt 382AMP | 43' 9" | — | Profiled |
| XLR Thunderbolt 413AMP | 44' 6" | — | Profiled |
| XLR Thunderbolt 422AMP | 44' 6" | — | Profiled |
Forest River’s XLR Thunderbolt brochure (filed in Forest River’s /brochures/2020/ folder; the brochure prints no year) lists 5 XLR Thunderbolt floorplans. Every one with a printed weight has a page here.
04 Notes on this floorplan
What Forest River does not publish for the XLR Thunderbolt 422AMP
Forest River prints no GVWR, 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
16,280 lb dry and Not published by Forest River GVWR, against this model’s 16,364 lb and Not published by Forest River.
06 Loading it for a trip
A full 158-gallon fresh tank is about 1,311 lb of water, 28% of the XLR Thunderbolt 422AMP’s 4,636 lb cargo capacity, leaving 3,325 lb. Across 5 XLR Thunderbolt floorplans the water share runs 15% to 36%, and 1 gives up more than this one. Nearest on that share: XLR Thunderbolt 413AMP at 28% and XLR Thunderbolt 369AMP at 36%.
07 Where this floorplan sits
Closest sibling: the XLR Thunderbolt 382AMP, nearest on the published figures. It differs on 6 of the 7 fields both publish (this plan first): length 44 ft 6 in vs 43 ft 9 in; dry weight 16,364 lb vs 15,729 lb; cargo capacity 4,636 lb vs 5,271 lb; hitch weight 3,643 lb vs 3,760 lb; grey tank 86 gal vs 80 gal; black tank 86 gal vs 80 gal. They match on fresh tank.
| XLR Thunderbolt plans | This plan | Position, low to high | Range |
|---|---|---|---|
| Dry weight (lb) | 16,364 | 5 of 5 | 13,644–16,364 |
| Cargo capacity (lb) | 4,636 | 2 of 5 | 3,496–5,551 |
| Hitch weight (lb) | 3,643 | 4 of 5 | 3,140–3,760 |
| Length | 44 ft 6 in | 4–5 of 5 | 39 ft 10 in–44 ft 6 in |
| Fresh tank (gal) | 158 | 3–5 of 5 | 102–158 |
| Grey tank (gal) | 86 | 3 of 5 | 64–118 |
| Black tank (gal) | 86 | 4–5 of 5 | 32–86 |
Either side of it by dry weight: XLR Thunderbolt 413AMP is 84 lb lighter (16,280 lb dry).
| Nearest XLR Thunderbolt siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| XLR Thunderbolt 422AMP | 44 ft 6 in | — | 16,364 | — | 4,636 | 3,643 | 158 |
| XLR Thunderbolt 382AMP | 43 ft 9 in | — | 15,729 | — | 5,271 | 3,760 | 158 |
| XLR Thunderbolt 413AMP | 44 ft 6 in | — | 16,280 | — | 4,720 | 3,323 | 158 |
| XLR Thunderbolt 381AMP | 44 ft 0 in | — | 15,449 | — | 5,551 | 3,335 | 102 |
| XLR Thunderbolt 369AMP | 39 ft 10 in | — | 13,644 | — | 3,496 | 3,140 | 150 |
All 5 XLR Thunderbolt floorplans: XLR Thunderbolt line hub.
| Other lines, nearest by dry weight | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| XLR Thunderbolt 422AMP | — | 16,364 | — | 44 ft 6 in |
| Beacon 41FLB | 18,500 | 16,360 | — | 42 ft 6 in |
| Mobile Suites 36 RSSB3 | — | 16,600 | — | 38 ft 7 in |
| Ambition 399TH | 21,000 | 16,900 | — | 43 ft 7 in |
| Vilano 377FL | 18,500 | 15,600 | — | 42 ft 6 in |
| Sportster X 3914X | 20,000 | 14,620 | 9 | 44 ft 5 in |
| Salem Villa 42ZEN | — | 14,404 | — | 44 ft 11 in |
Against the XLR Thunderbolt 422AMP: the Beacon 41FLB is 4 lb lighter and 2 ft shorter; the Mobile Suites 36 RSSB3 is 236 lb heavier and 6 ft shorter; the Ambition 399TH is 536 lb heavier.
08 Common questions about the XLR Thunderbolt 422AMP
How much can the XLR Thunderbolt 422AMP carry?
4,636 lb. A full fresh tank uses 1,311 lb of it.
What is the pin weight of the XLR Thunderbolt 422AMP?
3,643 lb as published, 22% of the dry weight (median across 2,002 travel trailers here: 12%).
What are the tank capacities on the XLR Thunderbolt 422AMP?
Fresh 158, grey 86, black 86 gallons. Off hookups, fresh water runs out first.
How long is the XLR Thunderbolt 422AMP?
44' 6" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
10 of the 18 fields this catalogue tracks are published for the XLR Thunderbolt 422AMP. Not published: GVWR, interior height, sleeps, slide count, axle count, tire specification, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: forestriverinc.com (linked below); the full source note is at the foot of the page.