Welcome to the forum. One extra I would add to Grahams comments is the rear chassis cross member. The one just in fron of the rear Bumper. The bottom of the cross member is a seperate "thin" plate and tends to rot on the earlier cars. A tap with something metal will give a ring or a thud. Bad news if it isn't a thud.
The floor boards are another to look at but not such a major problem as the areas outlined by Graham.What year are yo u looking for. Others will know the dates but their are key years of manufacture:
Cuprinol treated ash frame.
Galvanised chassis
Stainless inner wings/valances
Stainles bulkhead.
The later about 1998.
JMP
