Over the fifty plus years I have held a commercial driver's license, I have driven every type of vehicle that can be operated on the road in Canada, with the exception of a motorcycle. Tractor trailer trains ( double trailers totaling 70 feet long, ) liquid tankers, 48 passenger commercial buses, straight trucks, Ambulance vans, 14 passenger vans, and cars and pick up trucks. Why no motorcycles ? Ten years as an Ambulance Attendant convinced me those things can get you killed.
Driving is a SKILL that some people never manage to properly learn. Backing up is a matter of practice and attention to details. So is parallel parking. I used to be a driving instructor with Drivers of Canada and the in car training program devoted 2 hours to the subject of backing up and parallel parking. My training car was a Chevette automatic . The principles of correct backing apply to all vehicles regardless of their size.
If you can't back into a parking space or a garage, you are not a fully competent driver, in my opinion.