Fooling around with reskins;
Finally figured out what had been nagging my subconscious all this time - the trucks look like cardboard cutouts. Looking at them in CM I noted they're built in 1.3 content, which explains the appearance. Cloned, updated to 2.9 and did some tweaking;
Still not very good, but at least better.
Questions;
1. Anyone done a better more detailed set of GP trucks?
2. What's the minimum accepted build number on the DLS now? Pretty sure 2.9 has been obsoleted.