Firstly yes, they are manufactured to and tested to AS/NZS 4344 (Motor vehicles – Cargo restraint systems – Transport chain and components)
So can I use a load choker to belly choke loads?
Yes you can, just remember the load restraint guide 2018 recommends that it its choked over the top of the load, as it provides the tie-down force.
Load chokers can save a lot of time if you have multiple deliveries or drops and creates a more even tension around your load.
http://www.tegral.com.au/product-category/load-restraint/load-chokers/