I have fought with boat covers for dang near 50 years and every one of them is worthless LOL. I have started using cheap sheets, sewing them on a cheap sewing machine and waterproofing them with a mixture or mineral spirits and silicone caulk. There are a bunch of you tube videos for how to do this but basically dissolve (mix) silicone caulk in mineral spirts at a ration of 1 part silicone to 5 parts mineral spirits, or there about, and paint the sheet with it. It will shed water, will resist the sun as good as anything and if you spray it annually with the same mixture, with a garden sprayer, it will last for years. Sheets are cheap, light weight and best yet they breathe even when waterproofed as described.....they do not cause mold and rot like heavy tarps and PVC backed materials do. They can be sewn with a $80 sewing machine and normal needles and threads. Use some golf balls or some smooth rocks to make tarp tie points where needed and it'll work better than any commercial product. I have a frame for mine built out of 3/4 inch pvc with a stick of 1/2 inch emt inside it bent in a loang radius that spreads from gunwale to gunwale and I stretch the bed sheet cover over that and strap it to the trailer. It weights about 10 pounds for everything and I can cover my boat in about 15 minutes and uncover it in about 5. I have trailered it like this but I do not do it regularly....it will take it but it beats it up pretty good. I probably have $30 total in my cover and it covers a 1860 jon boat with an open floor plan from the transom to the bow and it even has a pocket for the trolling motor. I have a proper mercury outboard cover on the outboard but I made a cover like mine for another boat I used to have that covered the outboard also.