What is the Payload Weight Limit of My Truck ?

Should be a sticker in the door frame or glove box that has the dry weight as well.

If you're going to scale it, make sure it's full of fuel.

 

Fuel your truck up. Take it to a Cat or any certified scale. Weigh it. Subtract your empty weight from your GVW weight, that's how much freight you can carry. Do the same for the tandem truck as well.

 

Had a 2003 steel cab FL 60 33,000 gvw with twin 50 gallon steel fuel tanks and 24’x96” aluminum( not Frb) wood lined dry van body and steel lift gate. Weighed around 14,000 empty.
The M series I believe is an aluminum cab with aluminum tanks and with just a flat bed I’d guess around 10,000- 12,000.
Best to take it too a certified scale and weigh like @Dave_in_AZ said with full fuel.
The registration slip that is supposed to be carried in the truck should say it also, but It may also be a rough average guess if someone didn't register it to an actual weight ticket.

 

Like the other boys said, pull on scale empty & full of fuel & tools, & you..

Also you might as well go off of 32,000lb GVWR. Guessing the truck has a 12,000 steer, & 21,000lb rated rear.? Really aren't supposed to exceed 20k back there..

 

Last time I used a Cat scale was June of last year and it was $11.50 at the Loves down the highway from my house.

 

Gross should go something like this, Steer Axle 12,000 (aprox) Drive Axle 20,000, now if you have a tandem on the trailer it will be at 34,000, so gross 66,000. Now go to the Cat Scale fill up on fuel and scale out, subtract the tare weight from the projected Gross and you will have your Net Load weight. 66,000 (Legal Gross)-28,000(Projected Tare) and you could load 38,000 on the trailer. The Tare and gross is projected you need to get a scale ticket to be dead on.