How Long Can I go?

If You are in a long cul de sac you should be able to drive in and then back it in to your driveway in order to execute a turnaround the same as you might do in a campground,backing into a site. I live on a cul de sac and with my trailer hooked to my truck I am 58 feet. The cul de sac has a 105 feet diameter which is a lot larger, but I know I could turn around in a lot smaller diameter by driving into my neighbour's drive and then backing into my driveway. I live in the bottom of the cul de sac and do not have any difficulty backing into my driveway. My guess is you could easily turn a 25 footer around in the end of the cul de sac but you may have to maneuver forward and back a couple of times.
You may have some friendly neighbours that don't mind if you drive into their driveways to accomplish the turnaround?