Two problems with these axles, they use two mounting brackets per side, this would require modifications to the frame to add additional members to mount it to. They are also rated at 3500 lbs which is too stiff for trailers under 16' and would result in a very rough ride.
I was on the website this am and they have 2000 lb ends at 180$ per end, I could weld them on here at work no prob. So you think you would need to add a piece of square tube in place of the old axel?