2026 Forest River Sandstorm / Stealth / Shockwave3513GX

The Sandstorm 3513GX leaves Forest River's factory at 13,969 lbs dry, with a published GVWR of 17,250 lbs and 3,281 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 150-gallon fresh tank spends 1,245 lbs of that 3,281 lbs before anything else is loaded.

Dry pin weight is 3,250 lbs, which is 23% 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 3,250 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 Sandstorm roster this is the 11th of 15 floorplans by dry weight, in a line that runs from 7,439 lbs to 16,354 lbs. It sits in the heavier 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 13,969 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 15,609 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 17,250 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 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. 3513GX is a Sandstorm designation and this site does not decode it into a layout claim.

Sandstorm is a toy-hauler roster published under three badges at once, and the first useful thing to know about it is that Sandstorm, Stealth and Shockwave are the same sixteen trailers. Not similar - the same floorplan codes, the same dry weights, the same cargo capacities, the same tanks, checked field by field. So a shopper cross-shopping the three badges is cross-shopping one product, and the choice between them is a dealer question rather than a trailer question. Within that roster there are two real classes. Five plans are travel trailers, 7,439 to 9,399 lb dry with 1,155 to 1,855 lb on the tongue. Seven are fifth wheels, 9,459 to 15,749 lb dry with 2,165 to 3,765 lb on the pin. The lightest fifth wheel outweighs the heaviest bumper pull, so the two halves do not overlap and no plan here is a borderline call. Cargo capacity runs 3,281 to 5,676 lb on the fifth wheels and 3,771 to 5,300 lb on the travel trailers - the bumper pulls give up very little payload, which is unusual and is the reason to read the table rather than assume the fifth wheels carry more.

Fresh water is the single biggest line in this floorplan’s load plan. A full 150-gallon tank is about 38% of the 3,281-pound cargo capacity — enough that whether you tow with water aboard is a real decision on the 3513GX rather than a detail.

The published dry pin weight of 3,250 pounds is 23% of this floorplan’s 13,969-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.

Nothing above changes the ceiling. Loaded to its 17,250-pound GVWR the 3513GX is towing 3,281 pounds more than its 13,969-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

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 GVWR, the 3513GX sits 10 of 12 in the Sandstorm line: 17,250 pounds against a line that runs from 11,400 to 21,000 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: Sandstorm 3217GX is 90 pounds lighter at 17,160 lb GVWR; and Sandstorm 4017GX is 3,750 pounds heavier at 21,000 lb GVWR.

Against the 3513GX: the Bighorn 36RK is 50 lb heavier; the North Point 365RKTS is 50 lb heavier. 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 Sandstorm floorplans profiled here run 7,439 to 15,749 pounds dry and 28 to 46 feet of exterior length across 12 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 Sandstorm line hub.

This catalog tracks 18 specification fields per floorplan. Named sources publish 11 of them for the 3513GX. 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: interior height, sleeps, slide count, axle count, tire specification, 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 (85%) 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.