I have a BX-24 in very hilly Vermont (for the last 4 years) and have both R-4 and ag tires loaded. I think (my guess) that it has to do more with the tractor size, meaning the importance of having loaded tires. I nicknamed my Kubota "Flippy" because I feel it has a tendency to want to come unglued on certain hills and certain aspects (haven't "finished" the rollover yet, and would like to not). I usually (but not always) mow with the loader and the backhoe attached, and swing the backhoe uphill in certain spots. I also bought a spacer kit (blanking on the name of the company, but I love it) - spaced the rear wheels out 2" on each side. And you know what? That 2" on each side made about a 50% difference in the feel of my machine on hillsides. Can't recommend it any more highly, especially for a smaller machine like mine. Also, the kit was totally professionally done - all the machinework was tops, and NOW I have studs instead of bolts, so changing the tires (the weighted tires) is not nearly as arduous as it once was when I was doing it with bolts.
The one drawback with the spacers is that I had to have my 54" deck mower's rear idler wheels moved outward several inches, but the local dealership did it for under $100, cut, re-welded, sanded, painted, and did it so cleanly that it's very hard to tell that it didn't come out of the factory that way.
Summary: if you're concerned about your tractor turning turtle due to its small size, I think that weighing the tires is a plus. Haven't found a downside to it yet, personally.
BX-24, 2" rear wheel spacers, non-hydraulic thumb on the backhoe, brush hog, blade, slightly modified 54" deck mower w/gator blades (pretty good blades, too)