I've been running these MT tubes for 4 years now since my extreme 14.00x15 started leaking on the sidewalls/bead. I have had no issues at all with tubes. I like around 18psi in them, slides really good that way. I rarely have to add air.
https://www.summitracing.com/parts/mtt-9558
Tractor supply has a cheaper 15" tube, they are thinner than the Mickey Thompson's. I have one as a spare but have never needed to use it so can't comment on if its any good. im not sure why people dont like tubes, with as expensive as paddles are these days im going to run them as long as I can! I didnt feel any difference in ride or handling. If one ever goes flat on a ride, ill pull the outer bead ring and throw another tube in. But I haven't had to do it yet!