I only have a 1 bay garage and very small shed. I may eventually add on to the shed but for now either my large L&G tractor or my small CUT (or just its detached backhoe) have to be outside. I spent maybe $25 for an XXlarge motorcycle cover at one of the bigbox auto parts stores (maybe Autozone?). Hey, if its good enough for someones prized Harley, maybe its good enough for a tractor. It nicely covers either the BH or L&G completely or covers the whole front end and operator station of the CUT. The nice thing about this is its got elastic all the way around the bottom plus a couple of permanent "bungee hooks" AND its made of material that breaths and seems to be quite water proof, probably the same stuff they make lightweight camping tents out of. They sell bigger covers made for various sized cars that are only a few more $$ and might fit a whole CUT with the ROPS folded. The main thing is that you really want to block the sun's UV rays.
You have to be carefull with Tarps. A dark colored one in full sun will become a solar collector and cook your tractor.
I don't think thats good for the paint or a lot of the plastics. And it might also be the attraction for those insects as well. Bee's, ant's, etc love the heat to hatch their new family's.
Has anybody else out there tried the car-cover Idea?