NO you need to find the drain or see if the battery has a bad cell that is much too fast for a computer staying on so you need to have a drain test run to see what the pull is. If you left the doors open and the interior lights on for three hours the battery would not be drained so this is a major draw and the cause will have to be found.
If you have an amp meter install it between the negative terminal and the cable and see what the draw is with the key in the off position.
I suspect you will see 1.5 - 2.5 amps and pulling fuses will show what circuit the draw drops to normal levels then working down the circuit will show which component is the problem.
If you have auto lights be sure they are in the off position as there can be current flow through a headlight bulb without it glowing, same for the other lamps.
If you need a shop to chase the draw they should be able to find it within 1 hour labor time, I would not take it to a dealer if you do need a shop. Find an independent, certified shop that claims to be an electrical specialist.
You should not have to have the car attached to the RV to find the draw it should be present whenever the key is in the off position or there is a problem with how the wiring to the RV is installed in the car.
Let me know what I can do to help you with this