Also forgot, be thorough doing the "after pull" inspections as well (which there should be for the top trucks). I'm pretty sure someone was able to sneak propane by me last year at a pull in Northampton when I was teching.
A checklist is best as you don't forget something and can be fair to all competitors (you don't have guys saying they went top to bottom on my truck but barely looked at another), and use scales to your advantage for low trucks if you need to look under them and along framerails.