A: Hi charlie, The extension is 14.25 or 12 inches from the pin to the rack (I added a drawing to the listing, please scroll up to see it) Please measure from pinhole of the receiver to the outside of the tire. Yes, this bike rack will fit larger frame bikes that are not straight, you will just need to adapt the wheel position.
A: I am not familiar with fold up bikes but if you are saying the distance is 36" between the wheels with bike not folded, then yes, this will work. You can move those wheel holders to any position you want, they slide on the rail.
A: Yes. That's what's great about the Swagman XC2 RV rack. The adjustability covers a wide range of bike styles and sizes and it is easy to get the setup right for each bike. You will need to stagger the wheel holders (like the manufacturer's pictures show) to aid in the adjustment. Once you get the setup completed for the first time, you just leave it. The bike rack folding feature is not affected by the location of the wheel holders. Ride Safe!