Originally Posted by Ray F.
Covert it to 50 amp and be done with it.
Not so sure I would do that. I have encountered places with 30-amp-only service, and your new plug wouldn't then plug in at all.
A better way might be to get a 50-amp to 30-amp "pigtail"
, where the 30-amp, 120-volt service is derived from one leg of the 240-volt service.
Since power panels probably see many more 30-amp mate/de-mate cycles, the 50-amp connection may be tighter.
(No, it doesn't put 240 volts into your rig.)