Andgol,
You're asking the same question here and on JH without even clearly stating what you're thinking off - "towed" in one post then "carry" in the next one. If it's "carry" then you're looking at Pt 133 Class D ext load regs, but if you mean "towed" that's something different.
You just have to look at the very few operators in the US to do Class D work within a commercial AOC- Columbia River Bar Pilots with a 109, ERA doing SAR with 139s, Cougar sneaking in with C reg S92s - to realize this is pretty specialized, needing high-end equipment, and not something you're going to be able to do easily to make a few bucks in Vegas.