Mileage on axles

I bought a small travel trailer KZ 14 footer sportsman I am wondering how long I can pull it in a given day… Will it hold up for an 8 Hour Dr. it seems the wheels are certainly smaller than my truck and I was wondering if there was a rating for that I can't find one anywhere I know I can periodically check them to see if they're heating up but I'd rather not be in the middle of nowhere waiting for it to cool down any help will be good thank you