X3
Do not do it, however like Pete says if you no longer need the 240v it can be converted to a 120v 50amp outlet.
FYI don't think of the 120v50a cord going to your mh as 240v50a it is NOT.
Next time your in a 50a campground take a look at the breakerS in the pedestal, they'll
both be 50a.
Then you can start thinking of you power cord as
2 120v 50a circuits wrapped in
1 sheath.