This may or may not be painfully obvious, and I'm not sure if the owner who 'restored' this ben hur knows it, but the wooden slats are supposed to be milled with a tongue and groove its in the TMs and on my own unrestored ORIGINAL (w/data plate) ben hur.
If your planks look like this:
http://yfrog.com/n1paradetennisandbenhur02j
Fire your carpenter. And no, this is not a $3k trailer.
I also think (not sure, haven't put much time into studying ben hurs) that rubber wheels were mostly steel body/early war items. By 43 rubber was a strategic resource and the steel wheel was put into production. My 43 has the solid disk type landing wheel.