On pre delivery, make lots of notes on each area. Since you are going to winter in Myrtle Beach, ENSURE you know EVERY SAFE STEP TO WINTERIZE, de winterize, and re winterize. Life calls and plans abruptly change. If you are not in your unit with ample propane operating daily ( for ANY REASON) freeze damage can occur quickly.
The pre delivery likely will not review sewer hose operation in freezing weather! You need to know these things.
Outdoor water hose(s), etc.
If it's wet, it can freeze.
Remember, in cold temps, propane use is high. Try to gauge your tanks and weekly average usage.
A few years ago we spent the winter in Mesa, AZ. Moderate winters BUT, experienced a few ICE STORMS OVERNIGHT....trust me, I learned from experience!! Those damned tanks run out AFTER EVERY PROPANE CENTER IS CLOSED FOR THE DAY.....it's the propane extraction demon that resides in the tanks!!
Just say'n, think of your lists as OUTSIDE OF THE BOX.