The only thing having loose stuff in the cab is it all becomes missiles when things turn south. Your head is the target.
Actually, 90% of that stuff isn't even on the truck anymore. Since dumping the last company's numbers (I refuse to run PeopleNet), I'm on a more regular run, and only take what I'll need that day. Besides, I had to make room for my trainee to occasionally ride along...usually just picking him up at the sitter on my way into town or the rare Saturday if I've got to make a quick pickup or delivery.
Babies love Mack trucks, here is one of my grandson's, Aaron at two years old. He had a grand time riding with me for the day. I do have to say Pedigree, your securement looks much better than just the seat belt, love it!
Yeah, I wasn't thrilled with the strap/clips on the car seat's base...originally used them in conjuction with a 1" ratchet strap. Then, when it looked like it was going to be more than a 1-time thing, bought a 2" strap with the flat hooks. Cut off the curved hook, and drilled a hole through the flat part...bolts on just like the seat belt (but a MUCH higher WLL). I REALLY don't like those silly E-clips that you have to use with the 3-point auto-retract seat belts...royal PITA to deal with & get them tight. Bottom line, that carseat is probably the most secure item in my truck...which is fitting, because it carries the most valuable cargo.
I have a milk crate I keep a gallon of oil, antifreeze and washer fluid in along with shop towels. The rest is bagged or in a plastic container. My cooler is not secured but behind the seat. I keep a thick mat between the seats and rear that keeps things from sliding, and also keeps the floor heat from getting through to the cooler. Makes ice last a lot longer.
You wont believe what we had secured in our cabs over the years. Just one minor thought. Two actually. Stanley thermoses and airride seats do not like each other. Second, hit a big enough bad enough bridge approach anything loose is heading for your head if at all possible. The ONLY time ANYONE has ever thrown a fit over the contents of the cab is a bag of laundry in the pax seat when the VP (On his birthday no less) arrived to confirm that the automatic transmission is indeed bricked and in need of a heavy recovery wrecker tow back to shop. Reason, we never stopped rolling or turned off truck for months. Finally the buffer overflowed and contents of the entire transmission computer simply just did a classic windows BSOD. Manual for that one requires a turn off of everything at least 30 minutes every 7 days so it can clear itself. That little laundry bag bought us (A team) a standing order that half day every 7 is our time no matter what in the entire system.