Store the RV out in the desert for the summer. May only need a couple days if it is real hot such as in the Death Valley sun in July.
http://en.wikipedia.org/wiki/Bed_bugEradication of bed bugs frequently requires a combination of nonpesticide approaches and the occasional use of pesticides.[8][11]
Mechanical approaches, such as vacuuming up the insects and heat treating or wrapping mattresses, are effective.[8][22] A combination of heat and drying treatments is most effective. An hour at a temperature of 45 °C (113 °F) or over, or two hours at less than ?17 °C (1 °F) kills them;[22] a domestic clothes drier or steam kills bedbugs.[23] Starving them is difficult as they can survive without eating for 100 to 300 days, depending on temperature