OK, here we will talk about something familiar to many truckers, ratchet straps, as you can see, there are two words, ratchet and straps, and you guessed right, the ratchet straps are assembly of ratchets and webbing, think about cam buckle straps? yeah, they're cam buckles with straps! Relatively box truck business , the cam straps are most seen inside box trucks and on passenger cars. Ratchets are another story, the hardware is pretty strong, and because of it's mechanism, the ratchet can be pretty small and fairly large, it will be possible to find 1''-4'' ratchets around, and the breaking strength is often as weak as a couple of hundred LBS to as strong as 16,2000 LBS, it's pretty versatile compare to all other truck tie downs.
It is estimated that 80% trucks are box trucks, and the e track tie down system is merely for semi trailers, so e track straps are hottest cargo straps. And these straps are not as strong because the one we use on flatbed truck, the working load limit of typical e track straps is 1,000lbs, with minimum breaking strength of 3,000lbs. The working load limit of 2' e track straps are lower than other 2'' truck straps, the reason being the truck wall will provide support for the strain and prevent the strain from moving if stacked properly, nevertheless, you still must make sure the load in your truck are secured properly and the way to secure them work.
As per cargo securement standard, the look factor of ratchet assembly is 3:1, meaning that the breaking strength of the tie down is three times of the working load limit, this indicates a relatively forgiving work place, alternatively the look factor of transport chains is 4:1, which indicates the chains will be better fitted to tough conditions, such as very high/low temperature, moisture, as the aforementioned truck straps are only for normal conditions.
The truck straps usually created from polyester, which has low elongation and less elastic, that is ideal for tie down truck load, since we don't want the load on the cargo area to move or budge. When coming up with tie down straps, manufacturer must follow certain guidelines and pass DOT inspection, this means all the straps made for tie down purpose have to meet all of the requirements imposed by FMCSA(Federal Motor Carrier Safety Agency) and follow the guideline of WSTDA and ASTM.