Yup, that's the spot.
No, just the driver's floor in mine. Just a bunch of other PITA issues with dried out, cracked and broken wires. Rust is a very minor issue down here, and if the windshield wasn't leaking in mine, the floor would have been non-issue. I'm sure the leak combined with the carpet and 3 sets of floor mats holding the moisture in, it would be fine. I'm thinking that exhaust is original. I don't know how they work up in y'all's neck of the woods, but down here if the bend up a system they weld it together, and use universal hangers. This is bolted and clamped, and has what look to be original hangers.
I like that hitch! That is a monster! He put airbags on the back of it? What was he towing? I've been looking for a hitch, used or custom are my only options. I'm going to pull around a 5X8 open trailer, mostly to local swap meets and hopefully Carlisle. I think that would be much cooler than driving the Ram.