If you don't feel the need to model your own body, chassis, props, etc., then truck making is very easy to do in Blender. The only difficult part might be creating a decent paint. I've never tried making a track, so I might be a bit biased. Piecing things together in Blender with already existing models is relatively easy to do, but depending on the level of detail you want in it, it may take a bit of time to do.