Murray, the mains are mounted in the wings, so unless you are going to put the viper in the ute with the wings on, you should only need the measurement with the gear up
What alot of people are doing is to make 2 cradles for the fuz. These can be screwed down to the shelf in the van, with bungee's securing the fuz to the cradle.
You can also make the rudder removable, which makes transporting it even easier. It's a simple enough mod which Ali has on his and i'll be doing on mine. I'll post some pics when i get to that bit
Duncan