Beating Thermal Bridging between Trailer Mainframe and Tiny House in natural mold-preventative build

We are looking to design and build a mold-preventative tiny house on wheels roughly following some of the design/materials laid out in this build:

https://www.mychemicalfreehouse.net/2020/12/passive-house-tiny-house-detailed-mould.html

We've been learning a lot about failed tiny house builds where thermal bridging isn't avoided and condensation builds around bolts and trailer studs inside of the house.

If we build a subfloor in this way on top of the trailer, wouldn't the steel bolts running through the 2x6 sub floor down to the trailer crossmembers still cause a good deal of thermal bridging? Any ideas on this or how to beat it?

Thanks!