I don’t anticipate any leaks anytime soon as I don’t ride real rocky tough terrain, they told me it was for balance and much more smoother ride on pavement. But idk.
I've had two street legal machines with Big Horn's, which aren't really a street tire.
Never had a balance or "smooth ride" issue and I've had my P1k5 to 68 mph (the Teryx4 governor would kick in at 53 mph).
I have thought about using a sealant, but haven't yet. Sidenote: I use Stans for my tubeless mountain bike tires and it's magic.
I always carry a tire patch/plug kit (get the T handle type), Tireject liquid, and a Ryobi 18v inflator. I've used the Ryobi and a ratchet strap to seat the bead on a tire, so it's much better than the 12v cigarette plug inflators.
If I'm going somewhere distant I have spare on a hitch mount. I use a hitch extender if I'm carrying passengers and hauling a cooler/gear on the tailgate.