Not too familiar with either mount system, but if the Brophy are the type that use the bed rail sockets at the rear I'd be wary. One whoop-de-doo near the Mojave Rd. tore ours loose and bent them.
From an Engineer's perspective I've not liked the mounts that attach to the trailer hitch and go under the frame. They're too low and sticking out to the sides down that low. The tube used, necessarily, to fit inside the trailer hitch tube is rather small for their length. I expect that the spring in the Torklift "turn-buckle" is a duplication of effort and not needed. Those anchors are springy enough. Only they're not intended to be springs and as such I don't see them living very long in rough travel use.
This is probably why FWC's mount to the floor of the bed. If off-pavement travel is planned and off-road travel is expected and bed floor mounting is not an option then I would look into "rocker-knockers" that are structural enough to use for the forward tie-downs and a rear bumper that is structural enough to use as the rear tie-down.
Not to be argumentative, but I put a 2000-ish 6.5' Phoenix camper in the bed of our '95 Ram 2500 and have not added any extra springing in any form. I gather that is rare and I don't understand why. A 3/4t or 1t pick-up should be able to carry a camper like this without adding more suspension and without being dangerous to drive. Ours does and isn't. It sits level as well.
Edited by ntsqd, 12 September 2018 - 01:50 PM.