This is the way it's done around here. I realize it isn't what you're looking for. Whatever you do, never put them on one of those baskets behind you. All the sand you kick up ends up in your reels... well, the part that doesn't sand blast all the finish off of them.
I've seen people take about 6' of 4" or 6" PVC, put a cap on one end, and put a 12" to 6" or 4" reducer on it with a piece of 12" PVC long enough to cap the big end. Then you cut the end of the cap and use some weatherstripping to make a good seal. Then you use 20 bungee cords to hold on the piece of cap on that you cut off. It seemed to work, but it was cumbersome and awkward to use. Not to mention that your rods/reels are all bouncing around against each other in there. In other words, don't try it unless you fine tune a bunch of the issues.
Oh, the short answer: no. :lol: