My old buddy Electric Rick finally took a short break from his overtime rush in the county these days due to the storm a few weeks back.
He took a look at my RV set up & advised against doing what I had planned of tying RV into home connect box he installed for the Honda 2k a few years back.
His concerns seem to be for the unknown hardwire of the RV vs potential damage.
Since my 2k handles the house 'pretty good' on closely managed use, and my well pump is 220 along with cook stove, he advised, surprisingly, my 'best most reliable most economical' plan would be to upgrade to a 220 home unit and he would change the lead to the box.
While not the answer I wanted to hear, I've trusted him & his dad with my electrical needs for around 35 years. No troubles so far.