I am also going to say that the pictured cart is way too expensive for the type cart you will get. Those carts might serve for a few weeks to start a horse, but are not going to hold up well for daily use or even being used often. Weight is too small to be stong metal, which will fatigue and break when not expected. The wire-spoked wheels, especially non-motorcycle wheels, tend to fold over on turns. Not built for the torque a horse puts on them.
For your budget, you should be able to find a suitable cart and harness used, that are safer for your horse. Among things to look for, are springs under the seat for a better ride. These are leaf springs on the wooden vehicles, not little coiled springs. A nice back rest, which makes long drives a lot more comfortable. We prefer larger wheels, wooden on wooden carts. The bigger diameter will span ruts and holes for a better ride. You want shafts of cart to ride level on the horse sides, about midway down his barrel at the harness saddle. Uphill or downhill shafts put a load on the horse back, which he should not have. A wider saddle, 4" for 2-wheel carts, spreads the load of shafts better on his back.
Is horse already trained to drive? If not, you will want to check around for Driving trainers to help you out in learning and training horse. You want a solid education on horse when you drive. There are other Drivers in your area, maybe not close, but “near” as western distances go. They are usually helpful and informative folks, who can save you grief as you learn about Driving. Maybe even a Driving Club you could join.
The Driving Classified Facebook page does show LOTS of vehicles. A whole range of prices on them and harness that is out there, cheaper than new. New is not always better if you can get a better vehicle design used. The one you showed is a poor choice, though a LOT cheaper in my area. It won’t make you happy if you really want to drive much. Better to look around more, find a much more suitable vehicle, wood or metal, that you will enjoy better. Get some measurements off your horse, where that shaft location measures on his body, how long his body is, so you can get one the correct size for him. Get his body measurements, girth, chest from saddle side to other saddle side, bridle over his head, lip corner to lip corner, back length, stifle to stifle for breeching size. Reins are iffy, since shaft lengths vary on carts or carriages. Plus you want reins to fit your hands comfortably. 1" to 1 1/2" wide, may be strong, but they are tiring to use for any amount of time. My husband doesn’t use such wide reins!!
Lots to learn, so keep asking questions. You might want to read old posts here, tons of good information in them.
