Your right your not the only one that is or has in my case suffered this problem.
I had a hoist in my last car (KIA Caren’s) but being a seven seat MPV had loads of room for the hoist and fully assembled, captains chair in all, pavement scooter. However MPV’s are like Hens teeth these days.
With the demise of larger cars, or at least for we poor folk, finding something suitable that was easy in my last car was a nightmare in finding in a new car.
I settle for a compromise in a VW Tiguan that is by no means a big car that I had countless phone calls to the dealer and the installers of the hoist about the space required for my scooter, fully assembled that is and not broken into pieces as many are able to do but actually being the disabled driver and being able to assemble and dismantle the scooter is a whole new kettle of Fish.
After many an argument I changed from a hoist to lifting platform and archived my pavement scooter to the garden shed and bought myself an auto-folding scooter.
It works for me but it is a compromise because its expensive and in total with the lift and scooter costing me about £2,300 all told against the £600 for the Motability hoist but at least its mine and can be used in any car including my next car if need be. The other thing against folding scooters is there less comfort than the standard scooter seat wise although the model I have is said to have the most padded seat of all folding scooters along with all around suspension a rarity in this type of scooter.
Sorry about the ramble as its not much help as everyone is different in their needs but just thought I‘d let you know your not alone and best of luck finding a suitable and affordable car.