I can only speak of the Equal-i-zer, have the 12K/1200 unit and it works AWESOME! Had zero issues using it with our 35' TT, never experienced any problems with crosswind, passing trucks, etc. etc. Was a bit fiddly to set up correctly, infact, after initial setup I had to re-do it with camper loaded as it really did change from empty to loaded. (Yes, instructions tell you to set up with TT loaded but it was brand new when I installed, did not have a chance to load it up!)
If you are in or near DFW you can buy mine!
We no longer have the TT and I have a 5th wheel on order.