I think securement goes by weight of the piece being secured and the Working Weight Limit (WLL) of the chain/strap.
You need to know weight of the cargo each strap will secure. If the totes are “single stacked down the middle of trailer, then get straps that can hold twice the weight of a loaded tote. Or two straps rated at the weight of the tote. If the totes are stacked side by side down the middle, each strap, or all straps holding those 2 totes, should have a WLL of twice (legal is 1.5) the weight of the pair.
Your straps need to have strength for at least 1.5 times the weight it is holding. So a 100 pound item needs AT LEAST 150 pounds of securement. I think the common rule of thumb is to use 200 pounds of securement, in my example. This is not my field.
This is more of a flatbed/securement question, FYI.
https://www.fmcsa.dot.gov/regulations/cargo-securement/cargo-securement-rules
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