I purchased a TT last year dealer was throwing in the R3 for free as well, I choose to pay a couple hundred extra to move up to the EAZ Lift Trekker, which the dealership offered as there premium WDH with sway control. Both the R3 and Trekker are made by same company, CAMCO. I believe that the R# may only be 2 point sway control where as the Trekker is 4 point. May be worth while to call CAMCO and see what the difference is and if it makes sense to consider an upgrade, ( if dealer offers it).
My experience with the trekker was been very good so far, though I do not have anything to compare it to as its our first TT.
Good luck!