The hitch that Mopwr4me references is the Husky Centerline HD system which utilizes compression cylinders. OP is purchasing the Husky Centerline TS, a four-point anti-sway hitch design. This is the hitch that I use.
I went with the 600-800 lb bars for my trailer which is 5,200 lbs on the road with a tongue weight of 780 lbs (measured with a hitch scale).
For my trailer’s hitch weight, the 600-800 lb bars provide very effective weight distribution to my tow vehicle's front axle. Using the 600-800 lbs bars (for my trailer's weight) produces a relaxed towing experience, even at the top range of the hitch's rating. Using heavier bars than needed may produce a stiffer ride for the truck-trailer combination.
My advice to OP: for your E-Pro 19FD, go with the model rated for 400-600 lbs hitch weight.
2017 Cherokee Grey Wolf 25RL
2017 Nissan Titan SV 4x4
Husky Centerline TS