In my opinion, any manufacturer who decided not to include trucks with a kit is looking for an easy way to commit business suicide!
Wow! IMHO, this thought flies in the face of both common sense for those interested in the most critical modeling, and common experience when taking a look at the respected kit suppliers that have become the warp and woof of the prototype modeling that we embrace, almost none of which supply trucks or wheels. Like Tim O'C, I have bags of paid-for unused trucks and, especially, wheel sets that continue to clog the drawers.
I am usually very thankful for kits without trucks or wheels, and VERY thankful for kits without wheels.