I have a Gazelle G210 towed by a 2005 Grand Cherokee. I am happy with the overall quality of the trailer but it varies from unit to unit. Have a good look at the one you want to buy, not the the floor model. Check the fit of the windows and doors and pretty well any other thing you can think of. There are check lists out there, get one and follow it.
I had a Husky friction anti-sway thingee on it and it had a tendency to shake at the back a tiny bit. Probably due to the slack in the system. Changed over to a Reese Dual Cam system, no slack, and it seems better. I don't use it much so I probably haven't hit on the right combination of weight, balance and tire pressure yet. I think it would tow best with a longer wheel base vehicle.
Have the dealer explain everything to you as the owner's manual sucks badly. Ask where the GFI reset is. I haven't found mine yet.
Get covers for the tires as they are prone to cracking in the sun. 2 years and in the garbage and $300 to replace even with the warranty.
Get a factory installed ladder as they reinforce the roof as well.
Don't believe the dealer about the towing capacity of your tow vehicle. Yes it can tow it but when push comes to shove, the trailer shouldn't be shoving the tow vehicle.