My only input is that a 10K semi is going to likely cost you more in maintenance and repairs than you'd have in the 15K dually all together. Yes there's maintenance on a 15K dually, but not much at that point. Change the fluids, grease it and run it. Replace when worn out. The semi could easily cost you 5 grand before you even get it home. Also, if you're in a pinch, you can take that dually off the trailer and use it for anything. The semi, not so much.