I would advise on NOT going higher. Much easier, convenient viewing. I got a 1"x6"X2.5 foot finished, beautiful red oak board from HD and mounted it on the wall between the windows, close to the seat belt mount with bolts designed for heavy mounting in sheet rock. I got lucky and screwed the left side bolts (lag bolts) into the metal wall truss. All the other bolts are solid also. I can send a close-up the of the mounting detail, if you wish. Rook
When you get a chance to dance, or sit this one out......I hope you DANCE!
98 National Tradewinds 7370, powered by a 3126B 300HP CAT Turbo, Freightliner XC chassis