Suggestions/recommendations for motorhome cover

Your probably asking for a cloth type cover? There are plenty of threads on it here, but am sure some of the guys will advise. If you can do metal is much better, but not everyone has room or can afford it.

With what you are asking for I would suspect you will need to have the cover custom made. When we decided to have a Kilt manufactured (I wouldn't put a skirt on my "handsome" 40 foot 5er) Hired a company out of Boise, ID with a mobile tech who drove up to SE Washington and he spent two solid days in the winter cold manufacturing and fitting the custom Kilt. Made a big difference in temps under the 5'er. Within 20 mins the airspace under the trailer was 10 degs warmer then the outside temp.

I've never had faith in putting a cover on any of my RV's (TT's and A's). I know people swear by them but I have also read accounts of covers whipping in the wind and dulling the finish and others having issues with ripping/tearing. I'm sure those that use them will answer your questions....Good luck!

I used an ADCO cover for 13 years on our last RV and it kept it clean and looking like new. Never had any damage but we don't get a lot of wind here - some but not much.
I would get the Adco with the Tyvek top in a "custom" build. This will allow you to have the door opening where you want.

The only step up from there is a carport, which is what we did for our new TT.

Sunshield tarp to cover the top and whatever hangs over the sides, front and back. But the better answer is probably some kind of permanent garage.

Like I wrote, I feel my cover was a great investment and would do it again if needed.
But this is even better if you can swing it!