If your springs are already over the axles, you can use lift blocks. I have done this on two TTs with excellent results.. As with any mod, it needs to be done right. I made my own blocks out of 1/2 " steel that I welded together 3 of for pieces with 1.5-2" of lift . Welded in a piece of steel rod for the mount and drilled a hole on the other side opposite it. If doing this, you may need longer U bolts. I wouldn't go too crazy with the amount of lift either.