Stone
 - You need only superglue
 - When gluing, pay attention to the sufficient distance of the cargo bed from the driver's cabin, otherwise it will not come off and you will have to disconnect the cabin and turn the print 180 degrees (it happened to me :-))

Wood
 - You need only superglue, 8x wood or plastic sticks 100-102mm long and 4mm thick

PS: If someone comes up with another accessory, please let me know, I would like to print it for my son, thanks