e320 model 1995, station wagon
 

I have Merc 1995 model, e320, station wagon. Want to place my Mom wheel chair in the car. Should i go for the cross bars as the roof rails are already installed on the car. Or i should go for an attachement with the tugger which is meant for towing the caravan or boat carriers.
Any advise will be highjly appreciated as i dont want to put the wheel chair inside the luggage compartment
Thanking you guys in advance

i would use the tugger attachment, since the car has the rear self levelling it will keep the ride height normal, and it owuld be easier to load that putting it on top.