I would have reservations about either plug setup. If you had a 30A RV outlet that was code compliant and inspected that would be OK.
BTW An ispector would flag your 2 20A plug configuration.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob