OK - I think I'm gonna go for it. In reviewing inside my head, four factors stick out:
1. the run I'm making is no worse than when I use my regular cord + extension cord at those campground where the pedestal is in the wrong spot.
2. The wire I can get is identical to what is used in RV cords.
3. I can fairly easily control what will be in use at the same time while plugged in at home, so can avoid AC + micro + water heater scenarios.
4. If I ever upgrade to a 50 amp unit, I can either do a 50 to 30 pigtail or upgrade the wiring at that time.
This kind of goes against the always popular "do it right the first time" principle, but then again that principle assumes that you have the necessary funds to "do it right" today when in fact you may only have enough to "do it."
Thanks again for the input and for making me think this through carefully.
And, most importantly, this thread has boosted me over the 100 post mark on FRF. Only 19,389 to go to catch OC.