I noted the screw head problem Denny, but I believe it could be attached without doing that .... yes, hinged seat backs from 55 onward .... instead of the tray, I added a plywood 'shelf' that sits on top the tank full width, does the job well

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot