2026 Forest River IBEX25MLB

The IBEX 25MLB has 1,500 lbs of cargo capacity between 6,473 lbs dry and its 7,973 lbs GVWR, 19% 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 645 lbs, 10% 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: 90 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 15th of 16 floorplans by dry weight, in a line that runs from 3,778 lbs to 6,733 lbs. It sits in the heavier third of the line.

Plan the tow on loaded weight, not the 6,473 lbs dry figure: half the published cargo capacity brings this plan to about 7,223 lbs, and the published GVWR of 7,973 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 publishes no floorplan description for this plan in the channel this page is built from - only the numeric specification block. Rather than describe a layout from the floorplan code, which would be a guess dressed as a fact, this page carries what the factory publishes and says where it stops. 25MLB is a IBEX designation and this site does not decode it into a layout claim.

How the 25MLB differs from the other fifteen IBEX floorplans. Most distinctive first. How these ranks are worked out.

• Tongue weight as a share of dry weight, 10%: smallest of sixteen; next is the 20MKB (11.2%).
• Dry weight, 6,473 lb: second-heaviest of sixteen, between the 25RBH (6,338 lb) and the 26BRE (6,733 lb).
• GVWR, 7,973 lb: second-highest of sixteen, between the 25RBH (7,838 lb) and the 26BRE (8,233 lb).
• Length, 29 ft 9 in: third-longest of sixteen, between the 25RLSS (29 ft) and the 26BRE (32 ft 6 in).
• Cargo capacity as a share of GVWR, 18.8%: fourth-smallest of sixteen, between the 16MKS (18.5%) and the 25RBH (19.1%).
• Grey tank, 60 gal: largest of sixteen, level with the 20FKDS and 26BRE; next are the 16MKS, 20MDS and three others (40 gal).
• Tongue weight, 645 lb: seventh-heaviest of sixteen, between the 20MDS (630 lb) and the 19MSB (710 lb).

Next to the 25RBH, the nearest lighter floorplan by dry weight, the 25MLB is 135 lb heavier by dry weight, has a GVWR 135 lb higher, has a tongue weight 385 lb lighter, is 3 ft 2 in shorter and has a grey tank 30 gal larger; the two publish the same cargo capacity, exterior height, fresh tank and black tank.

Next to the 26BRE, the nearest heavier floorplan by dry weight, the 25MLB is 260 lb lighter by dry weight, has a GVWR 260 lb lower, has a tongue weight 115 lb lighter and is 2 ft 9 in shorter; 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 25MLB’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).