Currently, the tow bed can hold crates, but the wooden flatbed cannot. I believe this got mixed up in a renaming of JSONs, with the tow bed getting renamed to the wooden flatbed, and vise versa.

Yup, that's an issue all right. TBH I'm considering removing the tow bed due to people thinking the GMC can tow with it, and the bed being generally useless otherwise and not really too shiny that most people will use it.

This was fixed in pack V09.