Hotshot Axle Weight Distribution Checker
Enter your truck, trailer and cargo weights and see — axle by axle — whether the load fits inside your GVWR and GAWR ratings before you roll.
How axle weights work for a hotshot load
A hotshot load is not judged by its total weight alone. Two trucks can pull the same trailer and the same cargo, yet one can be comfortably inside its ratings while the other is overloaded on a single axle. That is because weight is shared between the truck and the trailer, and between the axles under each of them. The checker above estimates that split before you leave the yard, so you can move cargo, change equipment, or split a load while the fix is still cheap. It is a planning aid, not a verdict: this tool gives estimates only and never declares a load “legal.” Only a certified scale ticket, and the rules that apply to your route, can do that.
Start with the two ratings that are most often confused. GVWR, the gross vehicle weight rating, is the maximum total weight of a single vehicle, including the vehicle itself, fuel, driver, cargo and, for the truck, the pin weight pressing down on the gooseneck. You will find the truck’s GVWR on the door sticker and the trailer’s GVWR on its VIN plate. GAWR, the gross axle weight rating, is the maximum weight allowed on one axle, or on a set of axles rated together. A truck can therefore be under its GVWR and still be overloaded if too much of its weight sits on the rear axle. The same is true of a trailer: its total may be under its GVWR while its axles, rated together, are over their combined GAWR. Check both numbers every time, for the truck and for the trailer, because passing one rating never excuses failing the other.
Pin weight is the share of the loaded trailer’s weight carried on the truck through the gooseneck coupler. With a gooseneck, the coupler sits over or just ahead of the truck’s rear axle, so almost all of that pin weight lands on the rear axle. That is why a modest-looking trailer can push a one-ton truck over its rear-axle GAWR: the pin does not spread itself evenly across the truck. It concentrates on the back. When you add pin weight to the truck’s empty weight, you get the truck’s loaded total; when you subtract pin weight from the loaded trailer, you get the weight left on the trailer axles. Every pound that moves onto the pin comes off the trailer axles, and vice versa.
That trade-off is exactly why gooseneck placement changes the answer. As a rule of thumb, cargo centred over the trailer axles puts about 20% of the loaded trailer on the pin. Move the same cargo forward, toward the gooseneck, and the pin share rises to about 30%. Move it rearward, toward the tail, and the pin share falls to about 12%. Forward placement is not automatically wrong: it can steady a trailer and keep enough weight on the truck for traction. But it loads the rear axle and the truck’s GVWR harder, and it eats into the payload the truck itself can carry. Rearward placement unloads the truck, yet it can leave the trailer axles carrying more than their GAWR and, taken too far, can make the trailer sway. The checker uses these three typical percentages, which is why moving the placement selector changes the pin, rear-axle and trailer-axle figures even when the cargo weight stays the same.
For most hotshot combinations, the truck’s rear axle and its GVWR are the first limits reached. A typical one-ton dually may have a rear-axle GAWR near 9,500 lbs and a GVWR near 14,000 lbs, while its empty weight is already around 8,000 lbs. That leaves only about 6,000 lbs of truck capacity, and pin weight alone can use most of it on a heavy load. Add a full fuel tank, a passenger, tools and a toolbox, and the margin shrinks further. The trailer often has more headroom, because its GVWR and combined axle GAWR are usually higher than the truck’s limits. So if a load is going to fail somewhere, expect it to fail at the back of the truck first. When it does, the honest fixes are to move cargo rearward, remove cargo, use a truck with higher ratings, or use a trailer that carries more of the load on its own axles.
Confirm the estimate on a certified CAT scale before you commit to a long haul. Weigh the whole combination, then get the axle weights: the steer axle, the drive (rear) axle and the trailer axles, each on its own scale pad if you can. Compare each figure with the matching GAWR and compare the truck total with its GVWR and the trailer total with its GVWR. If a figure is over, do not just hope the next scale is kinder. Shift cargo a few feet, re-weigh, and watch the pin and trailer-axle numbers move in opposite directions. Keep the scale ticket: it is the only record that shows what your axles actually weighed on that day, with that fuel load and that cargo position. A CAT scale also settles arguments that no calculator can, because real trucks carry real toolboxes, real fuel and real uneven loads. Use this checker to plan, then use the scale to prove it. You can find more planning help on the Trucking Tools hub, and if the load is in Texas, run the Texas Permit Wizard and the Authority Checker alongside it.
Frequently asked questions
What is pin weight?
Pin weight is the share of the loaded trailer’s weight carried on the truck through the gooseneck coupler. It presses down over the truck’s rear axle, so it counts toward the truck’s GVWR and its rear-axle GAWR, while the rest of the loaded trailer’s weight stays on the trailer axles.
Why does load placement change the answer?
Moving cargo forward puts more weight on the pin and the truck’s rear axle; moving it rearward puts more on the trailer axles. That is why the same cargo can pass with centred placement and fail with forward placement, or pass on the truck and fail on the trailer axles when it is loaded too far back.
Can this checker tell me my load is legal?
No. This checker is an estimate from typical pin-share percentages, and it never declares a load “legal.” Only a certified scale ticket settles axle weights, and only the rules for your vehicle, cargo and route settle whether a load is legal.
Which limit do hotshot drivers exceed most often?
The truck’s rear-axle GAWR and its GVWR, because pin weight lands almost entirely on the rear axle. A heavy gooseneck load can leave the trailer well inside its own ratings while the truck’s rear axle and total weight are already over.