None of the individual allegations would bother me in isolation but...
Loaded handgun: fine, should probably be properly registered but I can overlook that
Expired tags: Don't care - but know that your tags are expired and behave accordingly
Weed stuff: Don't care but while driving is stupid
Three extra handguns in the car: If he's specifically on his drive to move, sure but probably lock them away. Any other case this one is weird.
All of the above: That's a bit shady. If this were a guy named Pat Downey or AJ Ferrari everybody would be skewering him. He's very likeable and historically is a good dude but this is a bad look.