Shut the gasoline off at the tank, let the engine run until the carb is empty and dry....  Turn fuel valve on before next use. Best to keep fuel off when on the road, bumps in the road shake the float letting a bit of gas by and it sometime migrates into the crankcase diluting the engine oil.

Hornet, following is an excerpt from the letter:

Customers with large horse trailers and generators mounted onthe roof aft of the trailer axles have experienced two types of failures.  Forces applied to the genset have causedcarburetor models to stall due to fuel slosh / flooding as the vehicle is driven.  Installations that do not meet the hot airrecirculation requirements have a higher frequency of this failure mode.  These same forces have been shown to damage thegenset mounting & isolation systems. Broken limit bolts and subsequent damage to the exhaust, housing cover,fan shroud, fuel lines & wiring have been seen.

For someone who works for Boeing, I would have thought you would surely be aware of modern technology. Here is just one of many solar generators available.   http://www.earthtechproducts.com/solar-e-power-cube-1500-plus.html 

 Costco in St. Peters has one just like this for around $5oo.  I was looking for one big enough to power trailer for a week or two at a time, but haven't found one that's affordable or portable enough yet. Hoping to tap into the knowledge of this board to assist in the search.  

Rockyrider ... That's a bit harsh.  Hornet's post is correct.  The "Power Cube" is nothing more than solar panels packaged in a box.    Unless the Power Cube has provision for tying their outputs together, it still will not power the usual RV A/C unit. 

Simple physics dictate the size of the solar panel needed to run, much less start a RV A/C without storage.   The power density of the sun's radiation on the surface of the earth is approximately 1.4 kW/m²    

^{Solar panels are much less than 100% effective in their conversion.}