I've added and subtracted length from my trailer on a couple of boats.

A good trailer guy can set you up with a sliding insert that can be affixed
with a truck sized pin ( or two, on mine). You can pick your length by
drilling extra holes. Just be sure you have enough still in the tube to be
safe. Lots safer ( I would think) than extending the vehicle end. You can
also tow with the shortest position and only move the extender out just
before launching.
--
RichG manager, Carolina Skiff Owners Group on MSN
http://groups.msn.com/CarolinaSkiffOwners
..

"mike92105" wrote in message
news:rmJqd.105138$SW3.48799@fed1read01...
I'm getting a sailboat (22') ready for trailering, last time out I seem to
remember getting my exhaust under water more than once. Hence I'm looking
at
getting a hitch extension. I've seen only 2 choices so far 4' or 18", it
seems to me that 18" is too short and I'm worried that 4' might be too
long,
any suggestions? For what it's worth I have a 4x4 Jeep Wagoneer now, but
it's an '88, don't know if it will be replaced by another 4x4 down the
road.