For mulit-use purposes, I am considering getting an 18 foot 7K rated car hauler to transport my 18 raft - and then to have available for all-purpose use.
Its a steel trailer - weighs about 2,000 pounds, with an 18 foot long 2X4" deck with about 6 foot 9 inches between the wheel fenders. The raft is 8 foot wide (and of course contoured) and I envision building up the deck height a little to miss the fenders.
My buddy has a mid sized Kabota that measures 17 foot long and six feet wide with the bucket and blade down (4K weight total). I'm thinking the car hauling is something that might come in real handy for our retirement years projects.