You probably won't have a problem doing what you suggest.
"I realize I will need to limit the load to under 15 amps."
The problem is that "EVERYONE ELSE" other than you who uses the RV needs to be aware of the 15 amp limit too. If they aren't, then you have created the possibility of having your dog bone adapters/extension cord(s) functioning as your circuit breaker which they are not designed to do.
When we were kids, we burned up my moms vacuum cleaner because we didn't know the limitations. Some how we managed to insert a 120 volt plug into an outlet that was wired for 220 volts. (it's a long story but we did it) That vacuum worked really good . . . . . for a few seconds. That's when the smoke started pouring out of it. My mom wanted a new vacuum anyway.
Chum lee