Going south through Portland OR on I-205 a few years ago I saw one of the carriers with two bikes attached stacked up against the guardrail. Guess they broke loose and the driver never noticed.
Bike rack on the hitch would be my preference. But now, we don't have a ladder so inside the Odyssey, on top or a hitch mounted rack either on the back of the MH or Ody will be the only way for us.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey