I put my ADCO cover on for the second time. Last winter being the first. and I have about 4 inches or so exposed on one side. Same as last year. I can probably adjust so that I have about 2 inches or so on either side, but I think it depends on what you have on your roof, how big your AC unit is and so on. Be sure your radio antenna is down, but I think every trailer is different. 6 inches is not going to make or break what the reason for the cover is for. I personally think you're fine.
"Take The Road Less Traveled"
2013 Rockwood Roo 233s
2013 Ford F150 FX4
I've been an RVer since 2007, Lifetime Camper