Pulled farther forward than you think you should. When backing, as you've noticed, the turn starts slow then goes quick. Once you figure that out, with practice, it will become easier. I can back my 42' FW into tighter spots than my 8' cargo trailer.
Find a large parking lot and set up five gallon buckets 12' apart and practice backing. I have small orange cones I lay down for the path I want to follow when I'm by myself and backing into a tight spot
Good luck
2008 GMC Sierra 3500 SLT DRW D/A 4x4 (Big All)
2006 Ford F350 PSD SRW King Ranch 4x4 (Henry) (Sold)
B&W Companion, 90 Aux Fuel Tank, Scan Gauge II, Curt f/m hitch, Swagman XC
2015 Forest River Sierra 360 PDEK
DW Diane, DS Michael, FB Draco and Sabian