Honestly, until you plug up ALL of the holes there is NOTHING which is going to drive them out other than poison.
You CAN still get Decon baits, they are now in a different "form" from what you have be used to buying.
Seen these at my local Walmart not long ago..
But in reality, you REALLY DO NOT WANT TO POISON THEM INSIDE YOUR RV!
Yeah, they take the stuff then die inside walls and such where you cannot get to them to remove.
Find a GOOD TRAP, trap them, but you REALLY need to plug up the holes, if you can't do it, find someone who can..
Don't bother with those "home" remedies, you will waist your money, time and the mice will keep trashing your RV..
Trust me, once they get into your heating system the smell NEVER goes away until you either sell the RV or burn it to the ground.