Cycle Carriers - Bailey Ranger

Hi

We are collecting our first used caravan next week and I am currently wondering the best way to carry 4 cycles without having to load them in the Caravan. I would prefer not to have them attached to the roof of the car as I would like to leave them onsite once we get there. 

Does anyone have any idea? I would love a rear mounted carrier as you see on motorhomes but I cannot seem to track any down that are specific to caravans.

Thanks in advance