Greg, I found this discussion that addresses the issues. In trying to back-feed your residential panel you would have to add an automatic transfer switch to prevent a live condition at your service entrance (or up the line/pole/etc) and a hazard for utility workers, as is done with standby generators. I envision a 2p 30a breaker and separate waterproof outlet, under the RV, thru a heavy gauge extension cord to a "scatter box" as used in construction. That could have breakers for further down stream protection.
RV.Net Open Roads Forum: Adding outlet to generator to power home circuits
Here's a more complete how-to:
http://beamalarm.com/Documents/motor...tick_home.html