Hopefully you have a surge protector/EMS being used also!! If you're still traveling across the country I wouldn't plug in anywhere, 30 or 50 amp, without one.
Back to your issue, try plugging into the 50 amp plug with your 50 amp cord that should tell you quickly if it's yours or theirs if you don't have a VOM meter to test both.
You said you don't need 50 amps, is it that you don't want to lug around the 50 amp cord? That's the only advantage I could think for doing it your way.
When I had a 30 amp RV I did just opposite, I'd use the adapter to plug my 30 amp into the 50.
If you've been in the southwest later than April you would need 50 amps to run at least 2 acs, 1 will never git'r done.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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