I too recently navigated this dilemma, for towing our Polaris xp 4. The swivel wheel was my first choice, until I decided to purchase a flat bed deck over trailer instead. The initial decision was changed because; the load limitations of the sw, the extended trail-over, the tires seem iffy especially if there is a blow out, and the ability not to pull it behind the tv (without major modifications.
The positives of a separate trailer, less trail over, tandem axles for greater stability, easily hitched to the tv, four wheel surge brakes, functionality of the trailer, and the ability to instal Reese sc sway control. In addition, I carry the genny, fuel, and accessories on this trailer. Overkill, maybe, however it's a small price for the additional safety.
The sw will lighten the pin weight, possibly require ballast in the nose. After building a large aluminum diamond plate cabinet to carry the genny and so forth, at the rear of the her, I had to load 400#s of ballast under the master bed to regain a descent pin weight.
