How to adjust a boat trailer?

[oteps]

I had issues like that when I had my roller trailer. The rollers make the boat slide on front to back but not side to side so if it is a little crooked thats how it sits on the trailer. Theres probably a better way to get it straight on the trailer, most of you guys are better boaters than me.
I got mad and took the rollers off and put 2 sets of bunks on the trailer. Kept the brackets just no rollers so the brackets still move. You can push the front bunks down in the back of them to help line up the boat. It went from a big pain to load to crank the boat on and drive out.
If I would have kept the rollers I would have put one of those wide rollers in the center with the screw type notches in it to help center the boat.
I think if it would have bent the trailer you wouldnt have a boat left.