https://www.amazon.com/gp/product/B097BJ4W14/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B01CCBVBDO/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1
yes you can run with it up, but it does flap alot depending on winds..... I do it for short distance, any...
Question, is your inside always really damp? (by the looks of the stains (runs)....))
For the mold/mildew spots, Mist with RMR-86
https://www.amazon.com/gp/product/B01N3Y22K4/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1
to keep id dryer in the humid weather use a small dehumidifier...
Amazon, don't over think this project (Oh, and a couple bungee cords, and a softball sized ball I stole from the dog to take a little slack up (put the ball in shade just behind the cabin and wrap a bungee cord around the ball and attach to the rod holder)) then attach the corners to the grab...