I was in the same kind of boat as the OP when I was looking to purchase a tractor. I knew I wanted the tires filled for the multitude of reasons already discussed. My research also pointed to Rim Guard or beet juice. I went to Rim Guards website and filled out their form. Unfortunately they didn't have any dealers listed in my area. Disappointed, this did not stop me from making my purchasing decision on the tractor.
I knew that people around here had liquid ballast in their tires. We had CC in the tires on the farm, so...
When I ordered my tractor I decided to ask the dealer if other customers get their tires filled. He said yes, the local tire shop is a dealer for RIM GUARD!! OMG! :shocked:
There is a button on Rim Guards website, "Become a Dealer." It might be a good idea to ask your dealer or local tire shop to fill out that form. Or find another company dealing in beet juice for tire ballast and become a dealer. If enough people in an area want it, it will become more economical for companies like Rim Guard to have a dealer in your area.
The lesson I have learned with this, and it as been true for many other things, is that you don't always know where/who the actual dealers are for a certain company or product. Just because their website lists (or doesn't list) someone in your area, does not mean that is accurate.
I used a different dealer to try and locate a piece of machinery a few months back. The website for the stump grinder listed Adams Tractor as a dealer. I went to Adams Tractor and asked about the price on this stump grinder. They never heard of this company. The guy behind the counter told me that maybe, someone, years ago ordered something small from them though Adams Tractor and now they are a listed 'dealer.'
With Rim Guard, I maybe way off base here. I do not know why they wouldn't ship to the south and only northern states. There maybe a real good reason, like heat. Though it gets hot here too in the north (98°F today), so I don't know. It most likely has something to do with shipping costs. But if they can ship to Spokane WA from Grand Rapids, MI (1846 miles), then I am sure they can ship to Mississippi (879 miles). I am guessing that the demand is simply not there for a ballast that wont freeze solid?