Take a long hard look at the boat for repairs. You know the car game so you know the drill.
Areas that don't quite look the same tap around, move a foot or so away and tap again. Does it sound the same?
If you have access to and know how to use a moisture meter check moisture levels, especially window and deck penetrations.
The mechanicals are a crap shoot but as they're gassers not too unfamiliar to you. Tug on the wiring near the terminals, everything you can touch. Supple or stiff?
Main ships in general are well thought of boats and I've never heard of ride quality complaints. I have heard of wet decks and sagging cabins. Do the doors, hatches and drawers open smoothly or are they bound up? Could indicate sagging support members, puddles in strange spots can too.
Again, good luck
It's easier to fool people than to convince them that they've been fooled - Mark Twain