I've never looked at trussing an axle before, but it was an interesting read about this product. Yes, you can put this on top of your axle, but you have to cut off the upper control arm mounts and coil buckets to do it. In the directions I think it said that you weld it on with 5 degree of caster, but depending on lift you can set it where you like. They probably assume you are using adjustible upper and lower arms so that you can fine tune it from that point rather than having everything built into your truss. I don't know of any outers to put on it to match a 5x4.5 lug pattern, but if you went with spacers I know they have spacers that will allow you to change the lug pattern. It looks like a good product, but it is going to take some work to get it installed. There is a lot of cutting and welding involved and it looks like the price goes up substantially when you add in all of the things that need to be reattached once the truss is in place.