2026 Forest River IBEX20MKB

The IBEX 20MKB has 1,500 lbs of cargo capacity between 4,913 lbs dry and its 6,413 lbs GVWR, 23% of that rating; filling its 40-gallon fresh tank at 8.3 lb a gallon uses 332 lbs of it (how to read trailer weights).

Tongue weight is 550 lbs, 11% of the dry weight as published; it rises as the trailer is loaded and counts against the tow vehicle’s tongue-weight and payload limits (tongue weight by size).

Off hookups: 70 gallons of grey and black capacity against 40 gallons of fresh water, so fresh water runs out first (tank sizes by length).

Against the rest of the IBEX roster this is the 9th of 16 floorplans by dry weight, in a line that runs from 3,778 lbs to 6,733 lbs. It sits in the middle of the line by weight.

Plan the tow on loaded weight, not the 4,913 lbs dry figure: half the published cargo capacity brings this plan to about 5,663 lbs, and the published GVWR of 6,413 lbs is the limit (how to read trailer weights).

Forest River’s line listing and this floorplan’s own factory page agree on all 4 shared figures. Dry weight plus cargo capacity equals the published GVWR exactly. A missing row means Forest River does not publish that figure (how figures are verified).

Forest River's own description of this floorplan reads: “The 20MKB is a compact yet full-featured travel trailer designed for adventure seekers who want comfort on the road. Its rugged design features a queen bed with overhead storage, a spacious kitchen with a large refrigerator and air fryer microwave, and a full bath with a high-powered 4-speed fan. The walk-in pantry offers ample storage space for extended trips. Built for four-season camping, it includes features…” That is the factory's marketing copy rather than a specification, and nothing in it is treated as a verified field on this page - layout descriptions, sleeping arrangements and feature claims in factory copy are not carried into the spec table unless the factory also publishes them as specifications.

How the 20MKB differs from the other fifteen IBEX floorplans. Most distinctive first. How these ranks are worked out.

• Tongue weight as a share of dry weight, 11.2%: second-smallest of sixteen, between the 25MLB (10%) and the 26BRE (11.3%).
• Tongue weight, 550 lb: fifth-lightest of sixteen, between the 16MKS (525 lb) and the 16MKD (570 lb).
• Cargo capacity as a share of GVWR, 23.4%: sixth-largest of sixteen, between the 20MDS (23.2%) and the 19BRK (23.5%).
• Dry weight, 4,913 lb: eighth-heaviest of sixteen, between the 19BRK (4,878 lb) and the 20MDS (4,963 lb).
• GVWR, 6,413 lb: eighth-highest of sixteen, between the 19BRK (6,378 lb) and the 20MDS (6,463 lb).
• Length, 25 ft: shared with the 19BRK; of sixteen, eight shorter and six longer, nearest the 19MBH and 19MSB (24 ft 8 in) and the 23MBH (26 ft 2 in).
• Grey tank, 40 gal: shared with the 16MKS, 20MDS and two others; of sixteen, eight smaller and three larger, nearest the 16MBJ, 16MKD and six others (30 gal) and the 20FKDS, 25MLB and 26BRE (60 gal).

Next to the 19BRK, the nearest lighter floorplan by dry weight, the 20MKB is 35 lb heavier by dry weight, has a GVWR 35 lb higher, has a tongue weight 60 lb lighter, stands 6 in taller, has a fresh tank 10 gal larger and has a grey tank 10 gal larger; the two publish the same cargo capacity, length and black tank.

Next to the 20MDS, the nearest heavier floorplan by dry weight, the 20MKB is 50 lb lighter by dry weight, has a GVWR 50 lb lower, has a tongue weight 80 lb lighter and is 9 in longer; the two publish the same cargo capacity, exterior height, fresh tank, grey tank and black tank.

IBEX is Forest River's lightweight four-season travel trailer, built at the company's Outdoors RV-adjacent end of the travel-trailer range rather than in the value tier. The roster runs from a 16-foot single-axle at under 4,100 lb dry to a tandem-axle 26-footer. Forest River publishes a full weight and capacity block for every floorplan, which is why this line could be catalogued completely rather than partially.

A full 40-gallon fresh tank is about 332 lb of water (water counts as cargo: 49 CFR 571.110 S9.3.2), 22% of the 20MKB’s 1,500 lb cargo capacity, leaving 1,168 lb. Across 16 IBEX floorplans the water share runs 14% to 36%, and 3 give up more than this one. Nearest on that share: IBEX 20FKDS at 22% and IBEX 23MBH at 22%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.110 S9.3.3).