My 'vote' goes for using 'regular' car tires - I have found trailer tires usually $$ about twice the cost and just seem to be too 'stiff' side-walled for a teardrop. I have been using 205/75-14 that I get from W-M for $53 each for years now = Made in USA by Goodyear for W-M, "Douglas" name brand which are marketed and warranted by W-M which makes them common & available all across the US if another is ever needed in the future. Have used this same tire on my daily 'driver' (smaller size) for years getting the 45000++ miles they are tread-wear rated for out of each with never having had a problem ever yet too speak of. (when working I was averaging 25-30thou++ miles per year back/forth to work driving Geo Metro's using them - that's over 30 years, putting almost 1 mil-miles on 7 metro's -retired now and still driving #7) Car tires 'ride' so much better than trailer tires that are just 'TOO STIFF' side-walled for a teardrop. Trailer tires are made for 'them' oversized "top-heavy" trailers. And if 'off-roading' is in the plan = I would be looking at using 'LT' (light truck) tires for the tear.............. just my opinion
Take care
PS what ever you decide on = when buying, always make sure you get them "balanced"