2026 Forest River IBEX16MKS

The IBEX 16MKS leaves Forest River's factory at 4,013 lbs dry, with a published GVWR of 4,925 lbs and 912 lbs of cargo capacity between the two. Cargo capacity is 19% 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 912 lbs before anything else is loaded.

Dry tongue weight is 525 lbs, or 13% 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 4th of 20 floorplans by dry weight, in a line that runs from 2,094 lbs to 9,975 lbs. It sits in the lighter third of the line. 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 4,013 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 4,469 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 4,925 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 16MKS is a rear-bath travel trailer that blends comfort, space, and versatility in an easy-to-tow design. A slide-out sofa opens the living area for relaxing or entertaining, while the front queen bed offers a private, comfortable retreat with ample storage. The spacious rear bath adds rare luxury, and the well-equipped kitchen—inside and out—makes mealtime effortless. Lightweight yet full-featured, the 16MKS…” 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.

Fresh water is the single biggest line in this floorplan’s load plan. A full 40-gallon tank is about 37% of the 912-pound cargo capacity — enough that whether you tow with water aboard is a real decision on the 16MKS rather than a detail.

The published dry tongue weight of 525 pounds is 13% of the 4,013-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 4,925-pound GVWR the 16MKS is towing 912 pounds more than its 4,013-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 16MKS sits 2 of 16 in the IBEX line: 4,925 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 19QRB is 10 pounds lighter at 4,915 lb GVWR; and IBEX 16MKD is 598 pounds heavier at 5,523 lb GVWR.

Against the 16MKS: the Viking 18DBS is 10 lb lighter and 2 ft longer; the Forest River No Boundaries NB18.0 is 15 lb lighter; the Jay Flight 180LKW is 25 lb heavier and 2 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 16MKS (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.