Back in the '70s I bought a old long narrow bed 3/4 ton Ford someone had made into a trailer. I used it for 8 years with the same old 10 ply tires that came on it when I bought it. They were cracked badly even then but held pressure even with 3000-3400 lb of green oak. The trailer was used on a 3 mile run down my paved county road. No doubt the tires wouldn't have lasted but 25 miles at 60 mph out on the highway. I gave the trailer to my neighbor who used it as a feed trailer behind his tractor. For a off road work trailer just about any tire with enough capacity will work.
