I switch over to those little car donut spares on my 5x8 utility trailer. I bought one out of somebody's trunk after a late night blowout, and love it so much I started to keep an eye out for them. I picked up 2 more found ones, and it pulled much better. no problems going 80 mph either (the warning is to save diferentials).
they are the best small trailer tires you can get!
they are the best small trailer tires you can get!