If you're riding with other people on similar trikes, it's fine. Yes, they have no rear suspension, but if you run the tires at ~2.2psi which is where most hardtail trikes run, then it'll ride OK for slow speed trail riding. You'll need a good gauge with a 0-10psi range, because any regular car tire gauge that goes up to 60+ psi has too large of a scale to be accurate at low pressure. You won't be able to find a digital car tire gauge that reads accurately at low pressure either. A quality pencil gauge with a 20psi max will work fine and those are pretty easy to find and inexpensive.
One like this
https://www.ebay.com/itm/Tusk-Low-Pr...rd!72058!US!-1
Ideally, the best would be a 5 psi max gauge, but that's getting into scientific quality and price gauges, also some really crappy ones may have come with some ATVs.
Tire pressure is important on everything, but put too much in a hardtail and it'll bounce all over the place and be rougher riding. Tires are the major compromise on a hardtail. Smoother riding means worse handling at higher speeds. Stiffer, better handling tires are rough riding. It's not a sport machine, so there isn't any need in ruining the ride for better handling. The tires that are on that Prairie are the best style to have. A 2ply, knobbie style tire. I wouldn't want to run that nice looking trike through any deep mud or water anyway, so no need for mud style tires.
Side hill riding takes some practice and steep downhill is challenging, on any trike. Got to get used to standing on the pegs and using body weight to control a trike.
Something else about the Prairie is it's only electric start. There is no pull rope or kicker if the battery goes bad. You may want to think about that before buying a low end battery. AGM batteries are good on ATVs because they handle vibration better than a flooded battery and there's no worry of spilling acid through a vent tube. They aren't any lighter weight and typically a little heavier. Lithium batteries are very lightweight, hold a charge almost a year, but are expensive and don't start well in cold weather until warmed up by leaving something like the headlight on for a few minutes.