I got lucky with my torklift rear tiedowns;
Started without the superhitch. Later, found a superhitch with the tiedowns and a 42" supertruss on craigslist for $500 total. That included all 4 tiedowns. I sold my original tie downs for $200 for all 4 and offset the upgrade. Total out-of-pocket was $300.
Wayne is right;
You do NOT need the Torklift hitch/Supertruss to flat tow. There is just zero tongue weight and it's not needed. I realized this when I met up with Wayne and we spent a couple days going over mine and his set-up for flat towing.
Instead of a 42" supertruss, I now have a 18" extension and a Ready Brake with the receiver ball mount on the end. It just clears my camper's bumper step and tows great. I did weld on tabs for the turn buckles and use those on the 18" extension just to keep the slop under control. My ball is 39" from the end of the truck receiver.
I thought about sticking a second 18" extension in the top hole and strapping it to the existing extension ala SuperTruss-style, and so I tried it. It's just not necessary and adds more weight and drama than is needed. Photos to demonstrate;
Wayne and I hooked up tow vehicles and put the extension we assembled for Wayne's through it's paces; everything from speed bumps to railroad tracks, full lock-to-lock turns, hard braking, evasive maneuvers, etc with cameras to see the action from the cab of the truck and also first eye view from riding in the bed while the other drove. This thing is solid.