Question 1 - Air conditioner struggles to cool camper

RV's do not have very much insulation like a home does, look how thin your walls are that ought to give you a clue, also what is the length of your RV, maybe one AC is not enough, mine is 32 foot long with 2 AC's, 55 degrees out the vent might be ok but the AC can't cool much better if heat is getting into the RV thru the thin walls and single paine windows.