Commercial or not, cleaner, neater (including yourself) will generally get you through with less hassle. Be respectful and do not offer more than asked for. If the officer is a complete jerk and you think you have an argument, save it for the court if you can.
Equipment wise, license, med card, logs aside, for you folks moving mowers and such, it is not that hard. Probably number one/two are the breakaway switch (as mentioned) and the tiedowns. Beyond that, the usual, tires, brakes, lights, proper registratin, three DOT reflectors and the correct, charged fire extinguisher. (Even if not commercial)
You think your being hassled? Try going through with air brakes where one little chaffed air line (not rubbed through) is going to cost you.
Four tiedowns vs two. Yeah yeah yeah, I know all about the 10k, etc. Thing is, especially if you are in a target zone, it is not that much more effort to go with four. Read paragraph one.
Consider this, one of my gigs was hauling pole barn materials throughout PA, NJ, DE, MD, VA, NY, CT. I could have anywhere from just the posts or tin to the complete package loaded on the truck. It may have taken some time now and then but I would have the load tied up like a stuffed turkey. Remember, the guidlines are a minimum. I got hassled over weight but not once did someone hassle me over the tiedowns.