It depends on the brand/cab configuration/drivetrain, but
An example:
Isuzucv.com
14,500gvw reg cab diesel, Body+payload = 8378-8564lbs.
check your vehicle GVW usually listed on the door sticker. Then subtract the weight of your truck with an empty flat bed. the remainder will be what you can haul.
26000 lbs of cargo? A tandem straight truck, such as a flatbed or a dump, could haul that amount of weight legally.
Where you would go to look at renting a flatbed truck all depends on where you live. Places that I would inquire about would be U-Haul, National Car and Truck Rental, and National Car Rental are just to name a few.
Swift Transportation, Roehl Transport, TMC, Werner Enterprises... they're all willing to haul cheap freight. Schneider National is, as well, but their flatbed division seems to be dedicated to certain commodities.
Legally, in the US, it's typically between 43,000 and 48,000 lbs of payload. The max legal interstate weight is 80,000 lbs. for the truck, trailer, and payload. How much the actual payload comes out to depends on the empty weight of the vehicle and trailer, and that'll be affected by a number of factors, such as the frame length of the truck, what the trailer is made of (steel or aluminum), etc.
For interstate travel in the US without requiring oversize permits, the gross weight is 80,000 lbs. What that translates to in cargo weight depends on the vehicle's tare (empty) weight. Typically, a truck with a flatbed trailer will be good for 45,000 - 48,000 lbs., and a truck pulling a dry box can typically haul 43,000 - 45,000 lbs. of freight.
Legally, about 140 - 150% of its tare weight. Most could haul significantly more if need be.
As much as it wants
A refridgerated truck can haul 42,500-44,500lbs of good depending on how heavy the rig is. The truck can gross 80,000 total.
Subtract the actual weight of the truck from 26,000 lbs (GVWR) to get the weight you can haul. This is assuming you are talking about a single straight truck with no trailer. It would be best to actually weigh the vehicle with full fuel tanks to get the most accurate measurement. You can get a weight at most places that sell gravel, stones, etc.
Well, that all depends on the trailer. With a Freightliner and an aluminum 48' flatbed trailer, I've always been able to haul in the vicinity of 48,000 lbs. on the trailer.
looking to be a certfied haul truck trainer