I have a new bunk trailer that has no rollers and sometimes if you dont get the trailer in deep enough the bottom of the v hits the frame of the trailer on the back and middle. So do they make rollers you can bolt on to the square frame. I havent found any?

Like these: http://www.championtrailers.com/ROLLERS.htm

HRG

You might think about using a self centering roller as you front most roller as long as you are adding them.
It will help center the bow when loading.
They are available at Cabellas or most anywhere trailer rollers are sold.

Morton

Look around. They make exactly what you are looking for. I had to put one on my last trailer. Only thing, make sure you buy one of the better ones(rollers) not the black ones, they leave marks.

Thanks all the brackets where what i couldn't find and HRG hooked me up.