Fiveflat, yes they are fitting for air vents. The tall one is so I don't have to bend down a bunch of time. Having done a few UDS's now, it's much easier on the back....even for a short guy like me.
I really like these mini's a lot!
My Propane tank build is almost the same size but it's way too heavy to be taking to one of my types of competitions (Not BBQ comps) I need to make one of these for those camps.
Thanks for the comments. Not sure about reinforcing the legs. The one and only smoke I did with it so far was all over the board on temps.! Had a real hard time keeping a steady "smoker temp" and it could have been because of the windy day.....but with no intakes open it was about 275 easily and sure was swaying in the wind.