Can you store it rigged on a trailer right at a launch ramp? Drive truck to ramp and hook up trailer or perhaps a private operated ramp would have a truck available.
Also, the fork lift system for rack launching boats can usually pick up a boat off a trailer. So you could store the boat on a trailer outside next to a rack launch building and have them pick you up and launch you. This would not be available at many yards so you'll have to search for one that can accomodate your special request