2026 Forest River IBEX20MKB

The IBEX 20MKB leaves Forest River's factory at 4,913 lbs dry, with a published GVWR of 6,413 lbs and 1,500 lbs of cargo capacity between the two. Cargo capacity is 23% of the loaded rating, and Forest River's own definition is worth reading before you plan against it: cargo capacity is what remains for fresh water, gear, food, batteries and every dealer-installed accessory. Fresh water alone is 8.3 lb per gallon, so filling this trailer's 40-gallon fresh tank spends 332 lbs of that 1,500 lbs before anything else is loaded.

Dry tongue weight is 550 lbs, or 11% of the dry weight. Ten to fifteen percent is the conventional band for a bumper-pull trailer, and this plan sits inside it as published. Tongue weight is not fixed: it moves with how the trailer is loaded, and weight added ahead of the axles raises it. A weight-distribution hitch is the normal fitment at this tongue load, and the tow vehicle's tongue-weight limit is a separate number from its trailer-weight limit.

Tank capacities are 40 gallons fresh, 40 grey and 30 black, 70 gallons of waste capacity against 40 gallons of supply. The ratio is what governs how long the trailer can sit off hookups: waste capacity exceeds fresh, so the fresh tank is the binding constraint and refilling extends the stay. Forest River publishes these three figures per floorplan, and they are the factory's numbers rather than a segment average.

Against the rest of the IBEX roster this is the 11th of 20 floorplans by dry weight, in a line that runs from 2,094 lbs to 9,975 lbs. It sits in the middle of the line by weight. Comparing floorplans inside one line is more reliable than comparing across brands, because every figure here comes from the same factory channel on the same day.

A useful way to read the pair of weights is to stop planning against the dry figure. Nobody tows a trailer at 4,913 lbs: that is the weight before water, batteries, propane, bedding, food, tools and anything the dealer bolted on. Load half the published cargo capacity, which is modest for a family trip, and this plan is already near 5,663 lbs on the road. Compare that number against the tow vehicle, not the dry weight, and leave margin on top of it - the published GVWR of 6,413 lbs is a limit rather than a target.

Every number above was captured twice from Forest River and checked against itself before it was published. The line roster block and the individual floorplan page are two separate factory renderings of the same trailer, and this plan's 4 shared figures agree exactly on both. Dry weight plus cargo capacity also equals the published GVWR exactly, which is the arithmetic check this site runs on every profiled floorplan. Where a figure is missing from this page it is because Forest River does not publish it in this channel, not because it was hard to find - and the row says so rather than being quietly dropped.

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.

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, so the whole line stays inside half-ton and mid-size-SUV territory on paper. Forest River publishes a full weight and capacity block for every floorplan, which is why this line could be catalogued completely rather than partially.

This floorplan carries its water comfortably. A full 40-gallon fresh tank is roughly 22% of the 1,500-pound cargo capacity, leaving the 20MKB with a usable gear budget even when you tow full.

The published dry tongue weight of 550 pounds is 11% of the 4,913-pound dry weight, which sits inside the 10–15% band usually quoted for stable towing. It is still a dry figure: loading the front pass-through and the fresh tank both push it up.

Nothing above changes the ceiling. Loaded to its 6,413-pound GVWR the 20MKB is towing 1,500 pounds more than its 4,913-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 40 gallons of fresh against 40 grey and 30 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 20MKB sits 9 of 16 in the IBEX line: 6,413 pounds against a line that runs from 4,915 to 8,233 pounds. That position is the useful thing to know, because the plans immediately either side of it are the real alternatives.

Either side of it in the same line: IBEX 19BRK is 35 pounds lighter at 6,378 lb GVWR; and IBEX 20MDS is 50 pounds heavier at 6,463 lb GVWR.

Against the 20MKB: the Jay Feather 19MRK is 13 lb lighter and 2 ft shorter; the Range Lite 200MLM is 13 lb lighter and 2 ft shorter; the Airelume 260 is 14 lb lighter and 4 ft longer. Those are differences in the published numbers only — what they cost, how they are built and how they live are separate questions each of those pages answers on its own terms.

Those are the nearest travel trailers from other lines by weight — one per line, picked by proximity on that figure and nothing else. They are listed so the same tow vehicle can be checked against real alternatives, not because they are equivalent inside; layout, build and price diverge sharply across that group.

For scale, the IBEX floorplans profiled here run 3,778 to 6,733 pounds dry and 20 to 33 feet of exterior length across 16 plans. Where a floorplan falls in that spread usually says more about which vehicle can tow it, and which site it fits, than the layout name does.

Every profiled floorplan in this line, with the full weight table, is on the IBEX line hub.

Named sources publish 11 of the 18 specification fields this catalogue tracks for the 20MKB (85% complete on the full field set).

Not published for this floorplan: interior height, sleeps, slide count, axle count, tire specification, refrigerator, air conditioning. Those rows are left blank rather than copied from a sibling floorplan.

Sourcing rules: methodology.