I towed with a Hensley Arrow for 12 years through all the lower 48 states and 5 Canadian provinces.
It is a fine piece of equipment.
They basically have two models, the standard Hensley Arrow and the Hensley Cub.
The Cub is for trailers with light tongue weights.
The standard Hensley Arrow can be used with different spring bars, dependent on your trailer tongue weight. I started with 1000 lb bars and graduated to 1400 lb bars when I got a heavier trailer.
The stinger bar is solid and comes in straight, 2" drop/rise and 4" drop/rise. You need to know your receiver height and tongue height to select the right stinger bar.
I have always found the staff at Hensley helpful and friendly. Contact them, they can answer your questions.
Russell
'12 GMC Sierra 3500HD SRW
'13 Excel Winslow 34IKE