Agree with Charl, had rollers on my 1st ski.
Bought it with the rollers on the trailer. The rollers were not 100% aligned and over time caused "hairline fractures" on the hull.
If you do install rollers, install plenty (less weight per roller) And make sure the are aligned perfectly (not inline, all pressing the hull with the same force)
Rather spend the money on an electrical winch with synthetic rope.