In need of help looking for motorhome cover

As caravanner for over 35 years we decided to change to a motorhome in 2017. Loved it and toured UK, France, and north of Spain.Further plans to sail straight to Spain in 2020 were scuppered by Covid, so to make up for the disappointment we bought another motorhome, an Autotrail Imala 730.  I wanted to get a cover for the whole van for winter storage as it is parked partially under trees. Does anyone know of an "off the peg" cover,ie Maypole 8m that would fit? I checked out the bespoke ones but they are very pricey. Any advice gratefully accepted.