Depends on how high your t top is really. Hard to make an accurate guesstimate without knowing . For V20 Cuddies the best oval pool size seems to be in the 12 x 24 foot size. Don't forget that these covers come with a 4 foot overlap, all around, so a 12 x 24 is really 20 x 32. More than enough to cover the bow and the outboard on the stern and most of the hull on the sides.
Check out National Pool Wholesalers. Buy the best one they have. (15 year) Their prices are hard to beat, The cover will last for years and years and it comes with a vinyl covered steel cable and winch to hold the cover in place over the winter.. Buy a couple of pool Noodles from dollar store or wal mart, cut them to fit and put them over your chocks and any sharp edge to protect the cover. Make a frame to "tent" the cover so water, snow and ice will slide off. OPEN all your hatches etc to the below deck area for ventilation.
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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.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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