Thanks for the reply. I usually do put the leg down when it is on the trailer, but because the repair was 'imminent', and the boat was going to be moved for the repair, I left it up (there is almost no ground clearance with it in the down position).
I've always thought it funny that the manual never said anything about putting the leg down - the only comment on the subject is about leaving it down in the water to make sure that the anodes stay covered to provide corrosion protection - but nothing about trailers!!
I'll give the dealer a ring.