Attached Link: surfing truck

I use a primitive (cylinder) from Bryce, situated at the pivot point where I want the doors to open.The meshes for the door are grouped and linked to that cylinder, which itself is linked to the rest of the car (also grouped)

Then I can simply rotate the cylinder "hinge" and the door follows.The cylinder is made invisible in the atributes window.I enclose a link to one of my products in the store that uses this Bryce rigging....I give  the hinges  different families so they are easier to select.

LOL, I never saw the green dot in all these years!Bryce allways so full of surprises...

My store: https://www.renderosity.com/mod/bcs/?uid=410087