In regards to the trans. you simply pull the rear tranny shaft out and make a press fit cap that replaces the rear oil seal.
While I also think the truck is interesting, the concept just doesn't seem to be cost effective and is wrought with issues:
- If it breaks down, how would you tow it?
- Is there a service bay set-up with a lift to put it on to service it?
- Can you imagine trying to maneuver around in town with that stretched wheelbase?
Just seems like a whole can of worms.
A stock truck and fifth wheel trailer set-up would be cheaper and much more manueverable. And it doesn't have any of the above issues. Additionally you still have a regular truck that is marketable to the masses.
Here is another concern:
http://www.pirate4x4.com/forum/showthread.php?t=859251
I can't speak for other states, but in Kalifornia, you will have to pull through the scales and will be subject to DOT inspections.
As long as a truck has a regular bed on it, it is considered a pick up, and is not subject to the same regulations as comercial vehicles. Any truck with a modified bed (not a pick up bed), must run through the scales and maintain a DOT BIT inspection program.
This has been a major issue at my work, where we have a fleet of service trucks based on one ton chassis. They have to scale up and perform BIT inspections. There was a big issue when one of them was pulled over for running past a scale house. CHP gave a class for the whole company after this. One thing that came up was 'modified' trucks. Anything with a modified bed, whether driven for personal use or for monetary compensation, must scale up and is subject to DOT inspections.