I've got a 20' bumper pull, and now a 35' 5th. I have had different length TV over the last 6 years, a Chevy Tahoe (about 17' long), a Chevy Suburban (about 19' long), and now a long bed crew cab about (about 22' long). With each change I lost some maneuverability backing in the bumper pull. Now backing in with the crew cab I have to go back and forth to get it lined up, when backing into my driveway; whereas with the Suburban I could do it in one turn.
Now the 5th wheel is a whole other bird. The only place I have to back it in, is at the RV storage lot where I have a 12' space at an angle. So far it has not been easy. The biggest issue, has been how much room the TV takes up while backing in. I've tried the "S" maneuver. I've tried without. I'm guessing there are a few things I'm doing wrong - probably the biggest is not pulling far enough forward and turning slowly and following it in. I figure I'll get it some day. But dang, the bumper pull is easy to back in compared to the 5th wheel.