Repairing the trailer is only worth it if you can sell it.
put some cheap springs under it and sell it.
While it is true that rollers offer an easier launch and retrieve where ramps are very gradual and one would have to submerge half the tow vehicle to dunk the trailer, the down side is they do not support the boat where it should be supported, i.e. the stringers or the chines. This is where the glass is the thickest, this is where the hull needs to be supported.Rollers "straddle" the stringers, and, thus, the hull resting on the rollers is in an area we call an "unsupported panel", and area with no stringers or b/heads. Thus, purely from the downward force of gravity, the hull will deform because of said lack of support. Proline used Loadmaster trailers, WC/Aquasport used EZ-Loader. When we had a new model, the trailer factories would send down a trailer "close" to what the model would take, along with a couple techs. Everything on the "test mule" was easily adjustable...winch stand, bow stop, bunks, both in and out and height. They'd do their adjustments and measurements, off they'd go, fab a prototype, fit check, make minor adjustments, then a boat/trailer package was born. Always with bunks, never rollers...When I see a roller trailer down here, I say damn, must be a northern trailer...and I'm from the north! Go with bunks, your boat will thank you!