2026 Forest River XLR Nitro40G17

The XLR Nitro 40G17 leaves Forest River's factory at 15,674 lbs dry with 5,326 lbs of cargo capacity. Forest River publishes no GVWR for this line, so the loaded rating is not quoted on this page and is not computed from the other two figures. What the cargo number covers is defined by the factory: fresh water, gear, food, batteries and every dealer-installed accessory come out of it. Fresh water is 8.3 lb per gallon, so filling the 150-gallon fresh tank spends 1,245 lbs of the 5,326 lbs before anything else goes in.

Dry pin weight is 3,765 lbs, which is 24% of the dry weight. That figure lands on the truck's rear axle and comes straight off its payload rating - not its towing rating, which is the number most often quoted and the wrong one for this decision. Pin weight rises as the trailer is loaded, and a fifth wheel loaded toward its cargo capacity will put substantially more than 3,765 lbs over the bed. Read the payload figure on your own door sticker rather than a brochure maximum for the model.

Tank capacities are 150 gallons fresh, 120 grey and 80 black, 200 gallons of waste capacity against 150 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 XLR Nitro roster this is the 3rd of 5 floorplans by dry weight, in a line that runs from 13,124 lbs to 16,949 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 these figures is to stop planning against the dry weight. Nobody tows a trailer at 15,674 lbs: that is the weight before water, batteries, propane, bedding, food, tools and anything the dealer bolted on. Load half the published cargo capacity and this plan is already near 18,337 lbs on the road. Because Forest River publishes no loaded rating for this line, the ceiling has to come from the trailer's own weight label rather than from this page, and the comparison you make against the tow vehicle should use the loaded figure.

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. There is no published GVWR on this line, so the usual arithmetic check - dry plus cargo equals the rating - has nothing to test against here. 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 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. 40G17 is a XLR Nitro designation and this site does not decode it into a layout claim.

XLR Nitro is the heaviest line in this group and it is a one-truck-class proposition throughout: five published floorplans from 13,124 to 16,949 lb dry, on dry pin weights of 3,160 to 3,765 lb. A pin weight in that band consumes most of a one-ton pickup's payload before anyone loads the garage, and cargo capacity runs 3,281 to 5,326 lb on top of it. Forest River publishes no GVWR for any Nitro floorplan, so the rating a buyer needs to check against is not in the factory's own spec channel.

This floorplan carries its water comfortably. A full 150-gallon fresh tank is roughly 23% of the 5,326-pound cargo capacity, leaving the 40G17 with a usable gear budget even when you tow full.

The published dry pin weight of 3,765 pounds is 24% of this floorplan’s 15,674-pound dry weight. Fifth-wheel pin weight rides in the bed of the truck, so it comes off payload rather than off tow rating — and it rises with the trailer as you load it, not in proportion to what you put over the axles.

Tank balance is generous here: 150 gallons of fresh against 120 grey and 80 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by dry weight, the 40G17 sits 3 of 5 in the XLR Nitro line: 15,674 pounds against a line that runs from 13,124 to 16,949 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: XLR Nitro 35G13 is 1,705 pounds lighter at 13,969 lb dry; and XLR Nitro 41G14 is 5 pounds heavier at 15,679 lb dry.

Against the 40G17: the Ahara 390DS is 10 lb lighter and 2 ft shorter. 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 fifth wheels 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 XLR Nitro floorplans profiled here run 13,124 to 16,949 pounds dry and 38 to 46 feet of exterior length across 5 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 XLR Nitro line hub.

This catalog tracks 18 specification fields per floorplan. Named sources publish 9 of them for the 40G17. The rest are not shown, because the alternative is reading a figure across from a sibling floorplan or from what the segment usually does — and a number nobody published is worth less than an admitted gap.

Not published for this floorplan: GVWR, interior height, sleeps, slide count, axle count, tire specification, awning, refrigerator, air conditioning. If you find one of these in a manufacturer document for this plan, it belongs on this page.

The completeness figure at the foot of this page (75%) measures the same thing on the full field set: it is a measurement of how much this floorplan’s manufacturer publishes, not of how much research went into the page.

How every figure here was sourced and checked is set out on the methodology page.