My 7x14 cargo trailer came with Dexter TorFlex suspension, and I love it. With the TorFlex suspension, there is no need for additional shock absorbers because the shock absorption is built into the torsion axle.
My TT came with leaf springs, but no shocks. I added shocks and now get decent tire wear and the trailer tows so good I have to double-check the tow mirrors to be sure it's back there. Maybe the ProPride hitch helps? But my cargo trailer with TorFlex axles and Reese Strait-Line hitch tows just as good as the TT with leaf springs, shocks, and the ProPride hitch. So I suspect proper setup and loading is as important as the hitch, until you get to one of those rare combination of conditions that will overcome the Strait-Line but not phase the ProPride.
Early in December, 2014, I ruined a trailer tire just as I was hooking up for a long trip. Darned mesquite throns punctured the sidewall! I mounted an old 205/75R15 tire/wheel on one TT hub and have 205/75R14 tires on the other three corners. I drove it 1,350 miles like that, from west Texas to Charleston SC with no problems, until I could stop near a big town with a tire store that had Towmax ST215/75R14C tires in stock. I replaced all 4 tires on the ground with the new tires, and put that old 15" tire/wheel on the spare. Now that I'm home again, I ordered a fifth Towmax ST215/75R14C for the spare.
Don't bad mouth Goodyear Marathon trailer tires. That old tire/wheel I found in the barn was an OEM take-off from my 2000 Keystone Sprinter 25RK fifth wheel that I replaced with ST225/75R15D tires over 13 years ago. No tire problems on the 5er since then. I expected that 14-year-old Marathon to blow out within a few miles of home, but it made it all the way to Charleston without a bobble, cruising at 69 MPH all the way. I checked tire temp with a laser temp gun every stop, and it never got over 100° - same as the three 2-year-old 14" Marathons on the trailer. Needless to say, I was surprised.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.