Ran airtabs on my last RV - mostly for the handling... ended up with an unplanned delay before my next camping trip - no time to order (I hope) - so was going to DIY a set...
but then I got researching on where to use them, and realized there's a big mess with towing 5th wheels and the aerodynamics (and better fuel economy means longer trips... I need a trip to the coast
). So now I have a thread in aerodynamics...