CHARLIE - MY TANK CC zero turn came on all brand new Carlisle tubeless tires, I haven't read the fine print on the sidewall but put it in the garage after mowing that first afternoon. Next morning I walk into the garage to go outside and the TANK is listing to Starboard. ( right) I ran it 3-4 years airing up the tire every time before I mow. I DID buy a tube, one of those cheap off-brand imported things from Blain's Farm & Fleet, haven't put it in, BUT it's not leaking near as much.
But NEIL is exactly correct, I know for a fact the tubeless tires we used at FARMALL LEAKED, roughly 5% leaked, that included the 2 sizes of large rear farm tractor tubeless tires in both 6 & 8 ply, R-1 & R-2 tread. Except for the tubeless fronts and the 15.5x38 and 18.4x34 tubeless we got inner tubes installed with a bit of air installed to hold the tubes in place, we kept a variety of tubes to fix the teeny-tiny fraction of a percent of tube-type tires that we pinched a tube installing them and had to repair them. Same exact thing goes on at Deere Horicon, they get between 2 to 4 flats a day. SEEN THEM myself.
My 70 & 72 both still have the Louisville Factory installed Good-Year frt 4.00/4.80x8 tires ribbed tires, not sure about the 70 but my 72 blew one tire sitting in the shop one night, about half in two. I glued a boot, vulcanized cord reinforced tire casing repair patch and pretty sure I put a tube in. But both the 70 & 72 will get new frt tires, just not sure what brand, I'd like Vredsteines, but I have more shopping to do. The ONLY things with tubeless tires here anymore is all 4 tires, I think, on my Pronovost dump trailer, 18-8.50x8 Carlisle's, my CC ZERO TURN, and wife's car and my pickup. In my opinion, ANY tubeless tire that runs less than 15 mph should have a tube in it. Tires that run over 15 mph can stay tubeless.