Agreed the tires are what needs to be strapped. But the Shock Therapy method of right at the knuckle works well if that’s all you have. I’d choose wheel straps first!
I ran into a couple of guys that had the Harbor Freight straps. They would not center on 30” tires - they rode up high and would not pull down as the tire was larger than they were made for. Maybe they had different ones?
I use a strap that only ties down on one side. It fits on 26” and 35” tires. Vulcan brand on Amazon. It matters where your D ring is located as the straps don’t have extra length. I had to mount different D rings for the Big Tire machine.
Just an fyi i have four 2021 units in stock (es,lime green,bluex2) Authorized Kawasaki Dealership in Southern California. Call or text for more info and pricing. Financing available oac 2.95% for 36mos $0 Down.