I’m not sure if this would work for a 400, but I did this with my 320S one trip. This was a 10x10 frame, and I now have a 13x13 frame and awning. It took two of us to “walk” the awning over the front of Bug, and I bungeed towels to the framing to prevent scratching Bug. It made a difference!
2017 T@B 320 Max S silver and cherry red, L@dybug ("Bug" aka my esc@pe pod), TV 2015 Toyota Highlander aka Big Red
I use a Patio / Garden Shade 'cover'. They come in lots of different sizes and % of sun blocking. Mine only blocks 40% and still lowers the cabin temperature by 3-5°F.
'18 320 S, pitched axle, 3020HE; PNW based TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller Adventures: 54Nights: 341 Towing Miles 43,780
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TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
Adventures: 54 Nights: 341 Towing Miles 43,780