01 What makes it unique
Keystone publishes three weights for the Sprout 18RBS: a shipping weight of 4,010 lb, a carrying capacity of 845 lb and a hitch weight of 455 lb. Those are Keystone’s own terms, and this page keeps them. Keystone does not call the first figure dry or unloaded weight, does not say the hitch figure is measured dry, and publishes no GVWR for any Sprout floorplan, so none of the three is renamed here and no loaded rating is worked out from them. The trailer’s own federal weight label, inside the door, is the document that carries its UVW, cargo capacity and GVWR.
Tank capacities are 37 gal fresh, 27 gal gray and 27 gal waste, as Keystone lists them. Fresh water weighs about 8.3 lb per US gallon, so a full fresh tank is roughly 307 lb on the road before anything else is loaded. The tire size Keystone lists is ST235/75R15D.
Against the 3 Sprout floorplans profiled here, this one is the 3rd by Keystone’s shipping weight, in a range from 2,950 lb (13RKS) to 4,010 lb (18RBS). Every figure in that comparison comes from the same Keystone page type for the same model year, so the comparison inside the series is like for like.
Every number on this page was read on 5 Nov 2026 from Keystone’s own floorplan page for the Sprout 18RBS. That page carries no model year, so the year comes from the roster page that links it, which lists the Sprout floorplans under the heading “2027 Floorplans”. Keystone notes that its website reflects the most recent production run and that features and specifications change during the year.
How the 18RBS differs from the other two Sprout floorplans. Most distinctive first. How these ranks are worked out.
- Shipping weight (Keystone’s term), 4,010 lb: heaviest of three; next is the 15RBS (3,375 lb).
- Carrying capacity (Keystone’s term), 845 lb: smallest of three; next is the 15RBS (1,000 lb).
- Hitch weight as Keystone lists it, 455 lb: heaviest of three; next is the 15RBS (375 lb).
- Length, 22 ft 8 in: longest of three; next is the 15RBS (19 ft 11 in).
- Sleeping capacity, 4: largest of three; next are the 13RKS and 15RBS (3).
- Hitch weight as a share of shipping weight, 11.3%: second-smallest of three, between the 15RBS (11.1%) and the 13RKS (11.7%).
Next to the 15RBS, the nearest lighter floorplan by shipping weight, the 18RBS is 635 lb heavier by shipping weight, has 155 lb less carrying capacity, has a hitch weight 80 lb heavier, is 2 ft 9 in longer and sleeps one more; the two publish the same exterior height, fresh tank and grey tank.
02 Full specifications
Dimensions
- Exterior length
- 22' 8"
- Exterior height
- 10' 5"
- Exterior width
- Not published by Keystone
Weights
- Dry / unit base weight (UVW)
- Not published by Keystone
- GVWR (max loaded)
- Not published by Keystone
- Shipping weight (Keystone’s term)
- 4,010 lb
- Carrying capacity (Keystone’s term)
- 845 lb
- Hitch weight, as Keystone lists it
- 455 lb
Capacities
- Fresh water
- 37 gal
- Gray water
- 27 gal
- Waste water
- 27 gal
Running gear
- Hitch type
- Bumper pull
- Tire size
- ST235/75R15D
Sleeping & layout
- Sleeps
- 4
- Propane
- 40 lb
- Refrigerator
- 10 cu ft
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
Can’t check: Keystone publishes no GVWR. A tow check needs the GVWR, the most the trailer may weigh loaded, and Keystone prints none for this floorplan, so this site does not work one out. Read the GVWR on the trailer’s own federal weight label and hold it against your tow vehicle’s ratings.
03 The Sprout floorplan family
Keystone lists 4 Sprout floorplans for 2027. 3 have a complete Keystone figure set and no existing page here, and are profiled, from 2,950 lb to 4,010 lb shipping weight; the others are catalogued on this page with the reason against each. Keystone publishes shipping weight, carrying capacity and hitch weight for these trailers, and no GVWR.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 13RKS | 17' 4" | 3 | Profiled |
| 15RBS | 19' 11" | 3 | Profiled |
| 18RBS | 22' 8" | 4 | Profiled |
| 19RKS | 23' 6" | 4 | Catalogued · Keystone publishes no height for it |
Keystone lists 4 Sprout floorplans for 2027. 3 are profiled here; the rest are catalogued with the reason against each.
04 Notes on this floorplan
What Keystone does not publish for the Sprout
No GVWR, no unloaded (dry) weight under that name, no dry hitch weight and no exterior width appear on Keystone’s floorplan pages for this series, so those rows read as not published. Nothing is filled from a sibling floorplan, 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). On a Sprout those figures come from the trailer, not from this page, and they govern the towing decision.
05 How it compares
3,375 lb shipping weight against this plan’s 4,010 lb (Keystone’s figures, same series, same model year).
07 Where this floorplan sits
Closest sibling: the Sprout 15RBS, nearest on the published figures. It differs on 3 of the 5 fields both publish (this plan first): length 22 ft 8 in vs 19 ft 11 in; sleeps 4 vs 3; hitch weight 455 lb vs 375 lb. They match on fresh tank and grey tank.
| Sprout plans | This plan | Position, low to high | Range |
|---|---|---|---|
| Hitch weight (lb) | 455 | 3 of 3 | 345–455 |
| Length | 22 ft 8 in | 3 of 3 | 17 ft 4 in–22 ft 8 in |
| Sleeps | 4 | 3 of 3 | 3–4 |
| Nearest Sprout siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Sprout 18RBS | 22 ft 8 in | 4 | — | — | — | 455 | 37 |
| Sprout 15RBS | 19 ft 11 in | 3 | — | — | — | 375 | 37 |
| Sprout 13RKS | 17 ft 4 in | 3 | — | — | — | 345 | 37 |
All 3 Sprout floorplans: Sprout line hub.
08 Common questions about the 18RBS
What is the tongue weight of the 18RBS?
455 lb as published.
How many people does the 18RBS sleep?
It is rated to sleep 4. No other Sprout floorplan here is rated for more.
What are the tank capacities on the 18RBS?
Fresh 37, grey 27 gallons.
How long is the 18RBS?
22' 8" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
8 of the 18 fields this catalogue tracks are published for the 18RBS. Not published: dry weight, GVWR, cargo capacity (CCC), exterior width, interior height, black tank, slide count, axle count, awning, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: keystonerv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 5 recall campaigns and 1 owner complaint (model years 2005 on) against the Reign, Hampton & Sprout line (a recall and a complaint are not the same thing).
Too few reports to show a pattern. 1 complaint has been filed on this line — not enough to say what fails most often. It covers 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 Reign, Hampton & Sprout line page.