Replacing stringers while on Roller trailer

[tartuffe]

As far as getting the cap on and off you could easily build a couple really large saw horses and use a comealong and some ratchet straps. That large forklift will run you probably $3-5 hundred each time you have to bring it out including the delivery and pick-up. Lumber in building a lift will run less than $150 including a come-along. Will need to be about 8' tall to provide the necessary clearance.

Lift the cap, pull the boat out from under and lower.

As far as getting the boat off the trailer, I once used a strap that attached to to the rear corner of my trailer, the strap went to the bow and through the eye bolt that your winch attaches to and back to the opposite corner of the trailer back at the transom. I was able to winch the boat off using that method. I would put a good amount of pressure on the strap, go to the front and lift upon the boat and it would slide 5-6" and repeat.