Not sure anything will take that environment. If you could find something made from Sunbrella, you should get a few years out of it. I use a cover from E-Z Touring that is made from something like parachute material. I only use it while traveling and most for overnight parking, so it sees only a little sun. It has held up well for 11 years now, but again, not in the sun all day. At least the E-Z Touring covers are much cheaper than anything that has BMW on it.
I am fortunate to have a garage for my LT so no need for a cover when not traveling.
LOL, based on this I just went to E-Z Touring and looked around, found The Wanderer, ok, great, oh look right at the top, Size A!
Size A is for all full dressers, including Harley, Venture, Honda1000-1200, BMW with travel trunk and R1xxxGS. Approx. bag size 10″ long, 5″ diameter. $115.00
Sounds plenty big...but no, lol...down at the bottom...SIZE X!
Size X is for the Cavalcade, Voyager, and Honda 1500/6, BMW K1200LT. Approx. bag size 12″ long, 5″ diameter. $118.00
The LT brings up the rear like an Australian Six-Trailer Semi
. Ordering, thanks for the tip!