Welcome aboard Murdog!!
I don't know of anyplace in my general area that would rent a boat trailer, particularly one of that size. Usually bunks or rollers need some fine tuning to 'fit the boat properly. It's not a one sized fits all based on length, though I'm sure many can 'make do'.
I assume you have a truck with the towing capacity for a boat that large? It would require a permit because its an oversized load.