One Kent has kept an archive of email messages for the last year or so
(thank you, Kent!).
http://potter-yachters.org/archive/
Therein you will find a thread discussing this issue in detail.
Personally, I use a Ford Explorer to tow a P15, and it is overkill for
a boat-and-trailer rig that weighs at most 900 lbs.
-- Robert Skinner, robert@140.com, Rockville, MD 20850 '87 Potter 15 HMS #1618 "Little Dipper" ECPA http://members.tripod.com/~SpeedSailor