Hi and welcome to the site. The V20 is one of the best inshore boats ever built, and it's ability to bring people home when the snot is bad are legendary. Good choice.
Does the engine still crank? If so then do a compression test. If the readings are all close to each other it should be ok. If the engine is ok then the asking price with the trailer is pretty good. As 3 Squids just said, do a tap test on the transom. Bring a rubber mallet and hit the transom all over. Listen to the sound the mallet makes. A dull thud indicates rotted wood behind the fiberglass. Also, raise the engine and then put some weight on the end of it while looking at the transom. If you see any flexing of the transom that's another indication of it being rotted inside.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
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