Speed, tires, and trailers, you won't get too many more responses if you had added smoky fires, dogs, or firearms, lol.
Yeah, if you plan on higher speed driving, I'd upgrade to an LT tire and if that isn't available in your size, to one of the Euro based commercial tires, and lastly, to a heavy P tire. If you use the trailer more than 10K miles a year, I'd suggest to upgrade your axle with one that has 15" rims.
FWIW, I have two popups sporting 13" tires and the wear/durability is surprising, especially considering the use of one of these. I have one trailer converted to a utility trailer and I absolutely abuse the poor thing. I use it in my remodeling business and sometimes, it's loaded full. I drive it around in the Metro area and try to keep up to traffic speeds on the freeway. I think the tires on that trailer are better than 6 yrs. old (I know).
Good luck with your popup!
