Theres an Xpack with a truck crane already in. Its called Trackside_Objects.
And by front end loader, do you mean Fork-Lift Truck?
If so, i have a high poly one which i`m trying to reduce to a low poly. Dont know if i`ll ever manage it, as i seem to have lost my poly cruncher plug-in for 3d max
Edit: Just remebered, theres an xpack called Dirt Track Equipment that has some building site type vehicles......try that.
Something like this?
Rfactor Track "Potrero de los Funes" has a very low polys crane,
Here It is the track
delu77. If you find a sketchup model that you like, I'll try to make a lower poly version of it for you. No promises you'll like it, but I'll try