A cab over could be adapted to coach use by making the tunnel out of three layers of material. the inside material could be any cloth, canvas or even a lite carpet-with an inner layer of insulating material like carpet padding or some of the newer flexible foan insulation that they use on pillow top beds- the outside layer could be a waterproof vinal....Fastened to the inside of the coach permently-the cab end could be a combination of velcro and snaps or even those clips like the army uses that the head twists after you put on the canvas....anyway with a little thinking and some measurements and someperson that could sew canvas, I wouldn't be afraid to try it...30" wide at most, and however tall should be all that is necessary.....when it comes time to service the engine unsnap the tunnel and tuck it inside the coach and pump the hydraulic or grunt and lift...not as easy but how many times are you really going to do this on a RV as opposed to a over the road truck?......If there were very significant cost savings-you know which way I'd go!....OY!.....geof
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