Hey Mena, where have you been? Or did they let you out early for good behaviour :)
We use this one. No trouble for over two years now. You can get the on/off remote for it (good idea) . We just leave it on the whole time we are off grid. Have the shore cord plugged into it (via adapter) and the converter turned off. Simple. Practise power management.
You can't stuff a big one behind places like a little one can go, because they need lots of cooling air around them. You need to mount the inverter close to the batteries too, so somewhere up front under whatever is against the front wall in the TT, so you have short fat wires out to the tongue where the batts are. (Drill hole in floor up front to pass the wires down and then up outside--do not drill through the front cap!)
I see they are out of stock for the moment--
https://powermaxconverters.com/product/pmx-2000w-psw/