37 MTR's are the way to go. Good choice if i may say so . I have a set on 15x 8 rims same b.s as yours and i run them around 8 - 10 psi all day and never have a problem. These trucks just are not heavy enough. My only concern with a 15x10 is that if you ever decide to run a weld on beadlock then your wheel will be to big for those tires. A weld on beadlock kit will add obut an inch to an inch and a half to the over all width of the rim. I sent my injectors to RC eng great find Thanks.
Cody @ 1/4 TiLT FabROCKation