If you go with a one ton SRW its gonna' need 19.5" tires and wheels plus some type of rear suspension help. These trucks rear axle runs from 7000 up to 7250 rawr.
These truck rear axle may weigh in the 3300-3400 lb range when empty which leaves around 3500-3800 lbs depending on actual scaled weights and the trucks rawr numbers.
Add 4800 lbs in the bed of a one ton srw crew cab 4wd truck plus 3400 lb empty weight = over 8200 lbs gross weight on the OEM rear axle/tires and wheels.
I would be looking at one ton DRW trucks for carrying 4800 lbs in the bed.....a white one of course.
New gas or diesel...your choice there.