My first smoker of any measure is/was what is now called the Yoder Cheyenne. Excellent build quality, simple design (not much to break), mine still works great and is quite old.
That said, if you're looking in the price range of the Kingman, I'd seriously consider one of the reverse flow smoker manufacturers. About the same size and on a trailer would be the Lang 60, and larger still on a trailer would be Bubba Grill's 250R. I dont think I've used my Yoder in a while since I got the Lang... The reverse flow evens out the heat (little or no hot spots) and same with the smoke flow (even).
Hance - Lake Dogs Cooking Team - MiM/MBN/GBA CBJ and comp cook
Lake Sinclair, GA (strategically about an hour from darn near anywhere)
Started competing in chili cookoffs back in the 1990's and have competed in more than I care to count. I became a CBJ in MiM in 2005, then MBN and in GBA in 2010. I've probably judged 130+- BBQ comps (sanctioned and unsanctioned) over this time. That said, I really enjoy competing more than I enjoy judging, and hope to get back to doing 4 or 5 a year in the near future.