There's a second gen truck here in Edmonton sitting on a little lot for sale that has a tandem SRW axles and the OEM box stretched with dual wheel wells. From the distance it looks good but I haven't pulled in to look at it up close. I won't deny that I've thought of doing something like the truck above but with a deck on the truck so I can haul three quads, jet boat, quad trailer, generator, fuel, tools and dog kennel on my current truck. Just wouldn't want that for a daily driver though.
Only because I couldn't handle hauling that much with a derated C&C version, or I'd have to modify the engine which I don't want to be in that game anymore.