OP here, and I think dougrainer and Old Biscuit called it. It's level, hasn't moved in two years, doesn't need to be defrosted because it self-defrosted when it went to 50 degrees. Agree about warm air coming in from a cracked drain tube, but wouldn't affect freezer.
Not in a slide, gas pressure is OK, plus works no better on electric than on gas. The flue is hot but the fridge is warm. I think it's time for that 10 cu-foot residential.
Thanks everyone for assisting. I'll let you know how we like the Whirpool (on sale at Sears this weekend). I sure hope the Norcold will go out the 24-inch door, I'd hate to R&R a big window.
Wayne