I only say this because I am in a similar situation to you (the same car is believe as I am getting an enyaq) and I have a q100r power chair. But I do have enough shoulder stability to manage a self propelled wheelchair, but cant stand for the time needed to bring down the chair Have you looked at transfer plates? They are only £9 i believe but then you could sit on the transfer plates, before getting in the car, take the wheels off a wheelchair (alot of compact self propelled wheelchairs have a button you can press and the wheel just comes off). That way you can then just get out the wheelchair and wheel round.