Since you already know you have uneven tire wear, you know you need an alignment. Trailer axles are made by several different manufacturers and some of say that you can align the wheels by bending the axle tubes, and some say that you cannot do the alignment by bending the axle tubes and if you do, it will void any warranty that may be in place.
My trailer uses Dexter axles and they CAN be bent and I have had one of my axles corrected for a 1/2" tow-in problem. Before you decide to bend your axles, determine who manufactures them, and investigate if and how their particular axles can be corrected. It could be that you just need to replace the entire axle and not bend your existing axle.