Joe, Length and width depend on which brand trailer the boat sits on. The boat is 21" long with about 2 inches extra for speedo pickups in the rear (with platform removed). The width is 91 inches at its widest. We sell boats to a lot of people with small garages so we do two things. We keep the trailer at 101 inches wide (or you can special order a 96 inch wide trailer that puts the boat up higher to get the fenders and wheels under the boat). We also sell all boats with a folding tongue that makes the trailer shorter or as short as the boat when folded. Our standard SAN on a trialer is 101 wide and 21' long. I actually had a customer cut holes in his drywall (for the speedo pickups)so he could get his garge door closed.
Hope that helps.