We have similar interest in fishing. Unless we're on a sightseeing mission we camp primarily in state parks and primarily those that offer good fishing. I am an avid hunter for good large mouth bass fishing. Just enjoy the sport because I am only interested in catch and release as a sport. My RV is now a Class C and car in tow. I have a small porta bote which I carry on top of toad and initially had same problem as you in how to get the boat once set up down to the river or lake. I solved this by purchasing a small trailer manufactured by Trailex.com. I have the model SUT-300 all aluminum and can be fully assembled in some 15 minutes. Basically two tires, axle, tongue in two pieces. Very simple I think the SUT-300 can carry up to 300 lbs. It is strictly for off road use. As long as I stay within the Park limits there is no issue in towing the boat down to the launch ramp. Trailex.com makes many different style trailers which you can see on their website. Once at campsite I assemble the porta-bote and the trailer and go back and forth fishing until we are ready to leave. I think the total weight for me on the trailer is only perhaps 150 lbs once I have loaded everything I will need when out on the water. I have been using the Trailex trailer for perhaps 8-10 years and its ideal for the life style we like. When we are camping there has to be good fishing nearby.
