Get a lightweight kayak / canoe trailer. There are lots of specialty ones available now. It'll save your back hoisting it on top of your Jeep and make it much more fun to go on outings. Some of the trailers fold up and have small dollies available so you can move it to your side yard or back yard. I'm looking for one myself for my canoe. They make them with really long tongues for long boats.
Here's one from Yakima:
Here's another from Malone. Check out rackwarehouse.
