2026 Forest River IBEX20MDS

The IBEX 20MDS has 1,500 lbs of cargo capacity between 4,963 lbs dry and its 6,463 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 630 lbs, 13% 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 10th 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 4,963 lbs dry figure: half the published cargo capacity brings this plan to about 5,713 lbs, and the published GVWR of 6,463 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. 20MDS is a IBEX designation and this site does not decode it into a layout claim.

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

• Length, 24 ft 3 in: sixth-shortest of sixteen, between the 19QRB (24 ft 2 in) and the 19MBH and 19MSB (24 ft 8 in).
• Dry weight, 4,963 lb: seventh-heaviest of sixteen, between the 20MKB (4,913 lb) and the 23MBH (5,108 lb).
• GVWR, 6,463 lb: seventh-highest of sixteen, between the 20MKB (6,413 lb) and the 23MBH (6,600 lb).
• Cargo capacity as a share of GVWR, 23.2%: seventh-largest of sixteen, between the 23MBH (22.6%) and the 20MKB (23.4%).
• Tongue weight, 630 lb: eighth-heaviest of sixteen, between the 19BRK (610 lb) and the 25MLB (645 lb).
• Tongue weight as a share of dry weight, 12.7%: shared with the 16MRJ; of sixteen, six smaller and eight larger, nearest the 19BRK (12.5%) and the 19MBH (13%).
• Grey tank, 40 gal: shared with the 16MKS, 20MKB 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 20MKB, the nearest lighter floorplan by dry weight, the 20MDS is 50 lb heavier by dry weight, has a GVWR 50 lb higher, has a tongue weight 80 lb heavier and is 9 in shorter; the two publish the same cargo capacity, exterior height, fresh tank, grey tank and black tank.

Next to the 23MBH, the nearest heavier floorplan by dry weight, the 20MDS is 145 lb lighter by dry weight, has a GVWR 137 lb lower, has 8 lb more cargo capacity, has a tongue weight 120 lb lighter and is 1 ft 11 in shorter; the two publish the same 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 20MDS’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).