I've had the unfortunate pleasure of dealing with a major water leak halfway through a hospital remodeling project.
In an extremely clean environment such as a hospital, things like mold have to be taken much more seriously than the average house or camper. Aspergillis is something that you and I breathe everyday, but it can be deadly to someone with a compromised immune system.
After tearing out miles of brand new drywall, we use a product called Sporicidin to eliminate the possibility of mold regrowing. We spray it inside the walls, on the walls, under the floor, on the floor, basically everywhere. This stuff will continue to work for up to six months after applying it.
You won't have to go to those extremes, and realistically shouldn't. The stuff isn't good to be breathing all the time, but it wouldn't hurt to keep a spray bottle of the stuff handy. Use it sparingly.
Let your camper air out thoroughly before occupying it again.
I bought a quart size spray bottle for my camper at Gas detectors | Thermal Imaging Cameras
You might want to consider a 100% foam mattress. I've found them to be a much better night's sleep than a conventional mattress. (Personal opinions don't mean much.) Latex foam won't harbor mold. I got a mattress with 6 inches of latex and 3 inches of memory foam on top for $525 delivered. I bought it from Foam N' More And Upholstery, Michigan USA