is it ok to leave your drive way up on your trailer?

I own my first boat and just assumed thats how it should be done.

I raise mine when I trailer, but if it is just sitting I lower it back down - less stress and strain on Bellows, etc....

You should lower it when its just sitting. Do you have to?...I guess not. But it certainly is less stress to avoid the high angles as much as possible weather sitting or driving.

I usually put it back down when in storage. If its freezing temperatures you should always leave it down.

This is an interesting thread because some of my hangouts have low water and I jack the drive up pretty far. Right now the boat is at the mechanics getting a lot of work done to the back end that after reading this, may have been attricuted to me driving with the drive up. The mechanic said that water got into the bellows, which screwed up(rusted) the gimbel and CV(maybe UV?) joints, which then in turn bent the driveshaft. Sound possible?