This ain't real encouraging guys.
The Escort I can probably do through the firewall, wish I had known the core was bad when I had the engine out.
The Camaro is a whole nother can-o-worms. Ever see under the hood? Looks like someone grouted the engine in. I think you have to pull the rear brakes off the car sitting next to this one to replace the core.
The motorhome won't be too bad, it's so old I can probably just knock the extra rust off under the windshield and access through there. It's a '77 GMC that came with factory rust around the windshield anyway.
The truck is easy enough ('86 F150), done that one 'afore.
The Thing has a gas heater.
JohnF