I don't know if I would be much help, because I don't have the diameter of our culdesac but.....
Prior to the MH we now own, my last 5th wheel was 44 foot toy hauler. The tow vehicle was a Ford F350 dually with the 8ft box on it.
I would enter the culdesac and drive around it as wide as possible and start heading back up the street going into the culdesac. At this point I was good for backing straight into the narrow (8ft X 90ft) drive, since the street just about runs into our drive. After that, it was straight back. The problem I had was that the camper pad ran 90-degrees off the drive right at the garage. That, coupled with the previous mentioned narrow drive, made for a tough turn, backing so I didn't hit the garage. Lawn had several ruts until I got the hang of it.
Ken & Laurie
2015 Berkshire 400QL