I have to agree with justin. From what I have seen in the past, most in-house guys were part of the regular "Maintenence" crew and only messed with fofklifts cause they had to. Most do not have the technical knowledge and training to do a good job that a Tech would have.
Unless a company is willing to commit to training a guy, it's best left to the Forklift guys.
Forklifts have changed a bunch in the last several years, unless you have some technical training or access to literature, you will not do well.
The liability issue alone is scarey, working on a car or truck is one thing, but forklifts fall into the "Industrial" arena, which changes the whole picture.