Here is a link that has info on the custom RV covers from ADCO.
https://www.adcoprod.com/custom-rv-covers#cover58
We got the custom "Tyvek RV" cover that is all white. I told them the year and model number of our Lance and they created an exact fit. It literally fits like a glove. I can install and remove by myself since it fits so well compared to the off-the-shelf cover we bought previously that fit loosely and had extra material. Only time will tell if it will hold up but as I mentioned previously, the Tyvek part of our 2 previous covers was always solid over time. I am hopeful and quite happy with it so far.
Stepper