So my SLW hubs finally arrived and I went to work. While you can use just a flat hex, it's not the most stable mounting point for bulky wheels. I wanted a more secure connection. As you can see, the hub has a ring indentation and a wide opening for the axle. With just a bare hex, it has the potential to wobble.
A better mounting point would be a crawling hex like those used on some other vehicles. Unfortunately, even though these hexes are 5mm just like the Telluride axle, they have a step in them that is smaller. They catch on the step in the Telluride axle and won't reach the pin. DOH!
The solution was to find a 5mm drill bit and bore out the crawler hex to fit over the Telluride axle. This is no easy task. Just try finding a 5mm drill bit at your local store. I finally got the bit in and went to work. Voila! The hexes fit perfectly now and take up all the slop on the SLW hubs. If you ever plan to use SLW hubs, you will definitely want this mod. Unfortunately I didn't need nearly the offset that I thought I did. The wheels almost clear the caster blocks as they are. Back go the 600 hubs and now I'm waiting for the 350s.