Freelander cycle carrier

I want to get the weight of 2 mountain bikes out of the caravan onto the Freelander [06] TD4, by using a spare wheel mounted carrier. The problem seems to be that the frame of the carrier, which fits over the top of the spare wheel, might foul the ‘high rise’ rear light.
Has anybody any experience of the sort of set up I am seeking? Or can propose a solution?
My car is garaged a long way from the house so I have no immediate means of checking