Originally Posted by hepcat
I've got the original manuals for my '95 E-250 Coachmen. Frankly, they're not very useful
I second that. I have a 1996 Coachmen M-19 RB-Ford E250 with all the books and those specs were not in the Coachmen book. I figured my fresh water tank is 20 gallons by measurements. Just search for a gallon volume calculator and evter the dimensions of your tanks. I don't recall exactly, but I believe my black water tank is 6 gallon and the gray water tank is 14. Check the back door for a sticker and inside the cabinets. Usually they are all marked. My gas hot water tank is 6 gallon.
The small overhead bed isn't marked but I just did a remodel and can tell you it is composed of a sheet of half inch plywood for the part that pulls out. The stationary side is literally the cut away roof of the van, plus some wooden supports and two a 3/16" sheets of plywood. It is strong enough for anyone short enough to be able to climb up and sleep in there. It will also hold a 215lb man and tools, uncomfortably.
Check NADAguides for RV values to get some of the specs and the model number.