"allbrandauto".....You don't say what RV you have and it's not listed in your profile, but often you can disconnect the locking arm at the top of the door and get another couple of inches in the opening, by swinging the door all the way open.
Typically, you need to remove the passenger front seat and then make sure you protect your dash with cardboard or blankets.
The Samsung's will run on a modified sine wave (MSW) inverter without an issue. My previous coach came with a 2000 watt Magnum inverter charger which was perfect for a residential. Even though it worked well, I wanted a separate inverter. I added another Magnum 600 watt inverter only. It had what is called a pass thru switch. That means it was connected to the coach's 120 volt system so that when the coach was plugged in, it automatically went to 120 volt operation and the inverter became secondary.