I know this doesn't help in the OP's location. But I often wondered what a month of outdoor storage in the lower southwest deserts would do for pests like these, termites, or bedbugs. What I read, the beetles are killed by 4 hours at 130 degrees. This is similar to the other pests. I've seen alternative curves for longer time at lower temps. You would think a couple of weeks of the RV getting to 120 plus in the desert sun would kill off a lot. RVs don't have the thermal mass of a house and don't have a foundation for sub termites to exist. Even not in the desert, (I live in OC), I've seen mine for hours over 100 degrees inside at times-if I haven't ventilated.
Temps in these lower desert areas can be 115 plus for days on end. Interior temps can and do go higher even in RVs