Good Evening Bill,
In short you are correct, I think the height and width would be OK but there would be some excess material at the front or rear of your motorhome which could be taken up by tightening the straps which hold the cover on to the vehicle. I had to do this when covering my own motorhome which was 7.3m, not including the bike rack.
Having said that I have someone coming over tomorrow afternoon, weather permitting, who is interested In buying the cover. If he does not take it I will let you know and if you are still interested you are more than welcome to have a look at the cover.
Regards Paul