I think this is very true. In addition, if I am in an ambulance trying to get to a hospital due to a life threatening event...and can't get thru the traffic it will turn people against this protest. I believe there is a good way to protest but I'm not sure what it is right now.
Find conspicuous places to park where the convoys can be seen, but will not impede or endanger.
Park there!
Be seen!
Be heard, without causing high levels of disruption in people's lives.
Fly State flags with the American Flags, and let people see this is from all over without having to read license plates.
If the object is to get attention, do that without inviting a 'spanking'.
Admittedly, this is not the same as a kid having a tantrum, but for the sake of the protest, don't do anything that can be portrayed as such.
Bringing attention to the issues in such a way as to not invite overweening criticism (propaganda, incidents) is vital.
The 12 at 12 concept is one such, where trucks pull over to the side of the road at noon for 12 minutes, then resume travel.