Re: walmart trailer tires
I've mentioned this in another thread about Carlisle tires. They have two lines. One is called Carlisle USA. The other which is where most trailer tires are made now is China.
Tires are not the place to skimp. Do you really want blowouts while pulling a 4000 lb boat (or any boat)?
I recently purchased the Carlisle USA from the local tire shop I go to. They mounted them on my current rims for around $120 for two tires on my 12 inch size rims.
Over the past 5 seasons I have gone through way to many tires for my rig, but a few were due to an axle I bent catches a rock at a launch area and didn't know I bent it until I balded two sets of tires. One set went in one 2.5 hr drive to a lake and the other set on the way back

So spring for a name brand well made tire and have your axles checked for straightness at an auto body repair shop.