When picking (or making...) a cover for the bike, it should cover everything down to the level of the bottom of the exhaust pipes, then stop before hitting the ground - or else, make it that way. I used a heavy vinyl cover like this for 36 years until a monster hailstorm shredded it: even in its death it saved the bike, and i have never had ANY sort of rust problems becuase it always lets air dry it out by being free of the ground and ground-effects. Mine stops about 3-4" above the ground.