Big Wing/Splitter on other vehicles?

How would I go about modding the big wing and splitter from the new hillclimb configurations onto other vehicles say the Bolide or ETK for example?

 

Its not a simple process. Copying over the jbeam is easy enough, but you have to move the nodes to line up with the new vehicle correctly and then move the flexbody location as well to match the new location of the nodes. Once you have that you need to manually add beams to connect the spoiler to the new vehicles physics model so it stays in place. Explaining how to do all of this is far too much for a forum post, which is why they have the entire wiki. Start here if you want to learn how to create and edit jbeams. http://wiki.beamng.com/JBeam_Introduction#Introduction

I wouldnt be surprised if more vehicles get the hillclimb treatment though in the future if you want to just wait