I used to have a Leer 100XL cap that worked well with my previous TT. I had rigged up a block-and-tackle system to raise it up to the rafters in my garage when I wanted to use the full bed for bulk material but that got to be too much of a hassle and took too long when combined with all the other prep work.
So I sold the cap and put in a BakFlip FibreMax - basically a G2 but with fibreglass top surfaces. Supposedly the finish on the fibreglass is much more durable and snow and ice won't stick to it nearly as much as aluminum. The hinges are rubber and totally sealed so there should be no trouble operating in the winter here.
Here are some pics of normal life and set up to tow. Takes 30 seconds to switch between the two including swapping the tailgate. The TV didn't have a locking tailage so I installed a Bully lock
. I also installed some LED strips under the rails with the front and back set switched independently tapped off the running light for the left taillight.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam