Well I have judged, including tractor trailers just not in a while. OTOH, I'd need air tix to get there.
Funny story; We had one guy that showed up with a spanking new 60 Ton Peterbuilt to show in a working truck class. We let him in, but put him on a 1000 point system in order to critique every nut and bolt as the rig didn't have 500 miles on it, (then averaged). I remember hitting him with TWO .5pt deductions from finding a fly split in half in his radiator! :laughing:
He ended up with 3rd, only because the guys above him removed their wheels AND FUEL TANKS AND STRAPS to polish them! (Including respraying the frame rails inside and out:buffing:.)