I have the Rankin cover too. Works well when towing behind my truck, but lifts behind the motorhome. Overall, the cover is top quality.
You might want to check towerbiminis.com. They custom make a very nice product. Plus, they will add any features you want to the cover. If your going to tow with the cover on, make sure it has a vinyl cover where the bow meets the crash pads and a soft, non-abrasive liner where the cover meets the boat (windshield, sun deck, etc). Just my opinion.