No sway control. When I bought the popup from my in-laws, they had a friction type Reese sway system that doubled as a minimum weight distribution setup, but the bars were too light for my van and I didn't need the WD. I lost one of the bars in a corner near the house and decided to just go with a 2" ball.
FWIW, the hopping trailer (the few times it happened) had ZERO effect on the van. I couldn't even feel it. I only know it happened because I saw it in the mirrors.
65 mph is the max rating for the tires. . . I was on a lot of US Highways and a few Interstates with speed limits from 75-80 mps but stayed at 63-65. Going slower doesn't seem safe or likely to happen on those roads.
The trailer is balanced, but it's not very heavy. I can pick up the tongue by myself. The majority of weight sits forward of the axle, as the fridge, our ice chest, the water heater, and a 2'x8' toolbox are all towards the front.