I have one and you dont want to go that route. They are large, need a place to secure while on the road, need to have window access for hose. Also most are single hose-so its pulling outside air in from somewhere, at best we'll see a 20° drop. Our old Coleman-would get camper colder than we're were comfortable with.
I was able to rework the window affair hose attaches to, eyebolts in frame to strap it down. But we rarly carry it, we simply do not sit with AC going. Carry only if we know we'll need it, stationary and will have power. (ie Gold Country in August etc). Could have used it in Needles last May (110° at 9pm) but not the other 16 days on that trip. Our justification was cost and the way we use-, and this can be used in the house.
Nice low amp unit, It does work but marginally. If rear wall free a simple window unit WAY better. A roof AC even better just more expensive.
Oh many portables the water/drain hose is either collected and empty occasionally-some dump it out the vent. They have a place just not a TC-3 times the cost, 1/3 the effciancy. I dont know but i would think in La you'd want an AC, a real AC. A window unit would be self or custom install. Roof AC bout any shop would do. If looking for used camper think cost for camper with AC would easily be offset by cost of adding?