I bought a used Yale GP060VX, serial# D875V03793N, from an authorized Yale dealer in 2020. It had solid tires and I got them to replace those with air filled pneumatics which are needed on our gravel lot with a slight slope. Since then, I had 5 flat tires and all on different wheels. The problem is that the tube and flap are protruding through the valve stem slot and overtime the tube and flap fail at this point. Attached are a couple of pictures of the valve stem slot and you can see the flap cracking from being pinched into the slot. Here is the sales person's response :"Unfortunately, I don't have any good news as far as the tires go. I have sent these tire pics to multiple people at the tire company we use as well as our service dept and none of them see any reason why these tires are going flat. So, the only recommendation I have is for you to purchase one spare tire and rim for the drive and the steer. This way when/if you get a flat you can change it and then we can bring the flat tire back and repaired."
He thinks they are the same type rims and I am worried if I go this route, I'll be fixing 6 tires instead of 4. Does anyone have any ideas? Thank you!