Turn buckles are good to help with sway, but it's also good to bolt through box.
Then Your insurance company will cover it as part of the vehicle if your in a wreck!
So do both!
Does the law state you need to do both?
According to the calgary police truck unit, the deck must be secured to the truck by bolting through the box floor using backing plates. He couldn't remember exactly how big the plates had to be but he thought 20 square inches per plate (times 4 plates). According to him using the factory tie down points isn't legal because they are not rated high enough weight wise. also he stated that the vehicle loaded (ATV/sled) has to be tied down in all 4 corners using straps that have a minimum SWL of 1/2 the GVW of the vehicle. FWIW.
Sounds over kill to me. I truck camper isn't installed that well. I bet he's gonna tell you to tie down the dishes in the camper.
I don't agree. Most campers are secured using engineered bracket systems that are bolted to the frame. I seriously doubt anyone would secure their camper using just the tie down points inside the box of the truck.
Engineered is a big word. A 1"1/4 square tube made of light metal bolted to the frame will flex as well. I'm not saying your wrong some camper tie downs have incredible strength. I built mine back in the day and you could really clamp the camper down with it, but really what do you think the chain is bolted into on the camper. The old campers had a eye bolt through a 2x2. maybe the new ones have a better set up but I seriously doubt that it has a big plate like you would like to see guys use to clamp a 800lb deck down with. yes yes I get that we strap 1100lbs on top of the deck. But legally we can only haul roughly 2000lbs in the box in total. deck and sled tied to four anchors in the box of each holding 500lbs from moving in mind is fine. Each to there own but I think the anchor points in my truck will hold 500lbs each. Maybe other trucks are not as good, can't argue this point.
Or a round of mechanics wire between the buckle ends works great too, anything to keep from backing ofI use turnbuckles and chain, Best thing you can do is slap a little blue loctite on the threads so they don't back off. Mine always used to come loose after a trip till I used loctite now it hasn't come loose in 2 yrs.
Or a round of mechanics wire between the buckle ends works great too, anything to keep from backing of