Hi everyone does any one know how I would get the right size awning for my van. We are looking to buy a second hand one [ebay] and one ad say's 7930 ground to ground,I'm lost. We have a Avondale Leda Cheviot single axle it's aprox 17 foot long excluding the tow hitch. can anyone please explain how I make sure it fit's oh we are after a full awning. Thank's very much, cheers.