OK, with a Freightliner based Toter you will have no problem towing a liftgate trailer. The size of the Toter will dictate the maximum length of the traler, as state laws varie, but figure 44' will be the max in any case. A 42' trailer w/ a twin-screw Toter will be over length in many states including CA.
Adding a liftgate will result in some sticker creep vs a hydraulic lift, as you also need a full length upper platform for parking of the vehicles. On the plus side, at the time of re-sale people like the 'bling' factor of a liftgate.
Do not limit yourself to just looking at Renegade, who has sort of become the 'Kleenex' of truck conversions. Renegades are heavy and gain weight over time, being built out of FRP which absorbs water. Their fit and finish is also mid to lower tier within the industry. I would definetly look at Showhauler and NRC as alternatives, esspecially on the Toter.