I just bought a very small trailer to use behind my ATV for farm use. Low
speed. It has 4.00/4.80-8 tires on it. They are a little dryrotted. Would
you get some tubes and put them in there, or just get new tires and use them
tubeless? Trouble I have with tubeless tires is half the time they're flat,
and they can be a booger to seat the bead. I put some Slime in there, and
once they seal, they're pretty good to go. My local tire place would
probably put the new tubes in there for the price of the tubes. I do
business with them, and they usually do flat fixes for free anyway.

Steve