Here is a picture from under the platform. Thanks for any suggestions

Does Oasis have a phone number where you can call and talk to someone? Or a dealer who might have some history with them? Without knowing anything, it would seem that the platform has those rails that it sits on instead of blocks. Common sense and the economy of the last few years would seem to suggest that they might have left the rails off as a way to reduce materials, weight, and cost of both manufacture ad shipping. Can you tell from instructions you got whether the current model is flat on the bottom? Someone at Oasis or a dealer should be able to tell you that, at least. I would think that adding blocks to the rails could do ugly things to the support of a tub filled with water and a person and could be less stable -- not to mention even higher to step into. So, bottom line, my totally ignorant, common sense gut reaction is that you don't need blocks-- but I hoe someone can tell you for sure as well as how to frame it. Sorry you were down for so long and hope you enjoy the tub.