We have a 2012 283ts, and tow a Subaru XV,
I think you would be asking too much of your rig to pull a dolly, car, and motorcycle. Depending on size/weight of bike, seems like your looking at around 5500 lbs or so. Borderline as far as what that year was rated to pull (I think it was 5000 lbs). Aux. brake system would be a definate must have.
Steve & Cheryl + Zoey, and Ziggy, our furry kids.
2012 Forrest River Lexington 283ts
Toad, 2013 Subaru XV Crosstrek