I probably should let this go, but when there is a 0% (or any low interest rate) promotion, you have to ask "Is there dealer participation?" If there is not, the factory does the financing and the cash and financed price is the same. If the dealer has to "participate" he can discount for cash. Some states require this to be disclosed in the fine print. Just ask and the dealer will tell you. I got 3 year 0% on my John Deere, same price as cash. 4 or 5 year 0% was available, but the dealer said he had to increase the price for those deals because it cost him.
I didn't realize there was variation on whether financing was provided by either the dealer, or the manufacturer. Maybe this explains why Kubota used to not offer cash rebates at all, until recently? When I was shopping they were willing to offer rebates in the neighborhood of $750-$1,000, but I believe that was a relatively recent development.
Regardless, as you say, the financing is either carried by the dealer or the manufacturer. That is, at 0% someone is paying finance charges, which means if you buy a 0% financed tractor that cost is being passed on to you through increased sticker price.
When I was shopping for tractors, any company that wouldn't give a cash discount left a bad taste in my mouth, as that basically told me they were overcharging for their tractor at the cash price.