Just a suggestion from my own experiences towing with a Prius. 100k miles plus so far on two different prius all over the continental USA. Air bags in the rear leaf springs! They helped lift the rear up to level things out due to the small camper and the added weight of camping gear. They also have the option of a small on board air compressor which could come in handy for many uses. Worked great on the air mattress.
Edit: this was the system i installed.
https://www.sdtrucksprings.com/index...AaAun3EALw_wcB