The Fiamma Carry-Bike Pro bike carrier is mounted onto the rear of our Jayco Stirling Outback caravan. This came on the van from the factory and we use it to hold two mountain bikes. There is plenty of room to mount these two bikes, with the handle bars of one bike adjusted to be slightly offset in order to remain clear of the caravan.
I am over 6 foot and find it relatively easy to load and unload bikes onto this carrier. A ladder may be required if you are any shorter.
The Fiamma Carry-Bike Pro holds the bikes easily and securely - they traveled around Australia on the back of the caravan without a problem.