In low range... they pull pretty good. I'm not sure how the Commander works at low speed... but on a RZR, in low range... my belt is fully engaged at about 2200 RPM, and at about 3 mph. My Islandia on the trailer (with water, fuel, and gear) is around 5200 to 5400 Lbs... so I'm not sure I would try to pull it up a boat ramp or not. The big problem is... my RZR is only 1000 Lbs. (actually 950 Lbs dry) So... the boat can pull/push it easy if things go wrong, since it out weighs it by about 5x. Around the house... it stays on the flats, and I don't go faster than a crawl.
Your speedster is 2800 Lbs dry... so let's say 1000 Lbs for the trailer, fuel, and gear... so, you are around 3800 Lbs, and the commander with fuel is about 1600. As long as you have a low range, and the ramp isn't too steep... you should be OK. With that said... I wouldn't tow it too far. Trying to go 10 or 15 mph for a couple minutes will be the death to the belt.
Oh... speaking of the belts... you should get a spare, and keep it in your buggy. (and know how to change it)