Trailer problems

[weidner21]

I have a Javelin 350A and about a month ago I was sitting in a parking lot with my boat. When I went to leave I was parked next to a concrete block. As i was pulling away I made a bone head move and wasn't paying attention to my trailer and turned to early and SMACK. I look back and I destroyed my tire on the right side of my trailer. I put my spare on and proceded to leave. Well its been alittle while now and i have noticed alot of wear on the inside of the tire.Also the other tire on the other side is starting to get wear on the inside.Is that due to the other tire being out of line? When you look at the tire you can tell it is alittle out of line and crooked. So my question is how do I go about fixing this? Is it something I can do on my own or am I going to have to take it to the shop? Also what type of cost am I looking at? How much would a new trailer axel cost me if that was my only option? thanks weidner21