i think its a joke people are trying to say straps are more secure than bolts to the chassis, feel sorry for the noobie who reads this posts and goes for the cheaper alternative, especially if he/she has kids and god forbid an accident does happen.
No ones actually said anything about being more secure, they just said it would be it would be secure
Its like holding a bar with two 50kg weights on each side. If you hold it with one hand you struggle, with two hands its easier as you spread the load. If you hold the bar in the middle its harder than holding at each end as you are distributing the weight rather than focusing it at one point.
Same with the straps.... If you just have your cage bolted to the floor/chassis then you are are only still relying on the floor panels/chassis on holding there integrity, just as with straps.
But having an 800kg tank (for example) with two 400kg ratchets at either end you are distributing the weight evenly so each strap takes 400kg worth of force not the full 800.
From how i understand it (may be wrong)If you're make sure you have them strapped on each side with the two straps they will actually be taking less weight than that...
I agree that using spreaders etc is safe, but i dont think to just turn around a say ratchets are no good is wrong...
(Feel free to tell me i'm wrong, i might be, thats just how ive understood it)