Will this fit my boat?

[MDRichmond]

I've found a 2019 tandem axle trailer for sale that was originally made for a Mastercraft NXT 22 ft. Will this work for my 2002 SAN 21 ft?

[Scooter G]

Trailer has good bones, and definitely an upgrade, but may be an overkill. The weight distribution is going to be off with the foot difference. You will need an adaquate reflection in the price to adjust for bunk and roller modifications, and I do mean adequate. Check the spec measurements on the SAN vs the MC, this will give you an idea of what you are up against... Pretty unlikely it will be a slip on and drive down the road.
This is just my opinion, and many years of fighting and wrestling with boat trailers, someone else may know differently.