So after the discussion on here and on facebook with Bo I decided I needed to move the track rod but I didnt want to move the servo from the factory mounts.
An hour or two on CAD with the vernier calipers and TLT1 swivel in hand and I ended up with this:
Which after some fettling (2 revisions) has left me with this:
Much Better!
Being a person who can't leave stuff alone even when it works I decided to revamp the transfer box and give it a new sleeker appearance and reduce wasted material:
Combined with the new 20t 48DP 5mm bore pinion from America (via Hong Kong) I now have a smooth turning transfer box.
With all this coming together nicely I managed to take the truck for its first test trundle for my birthday last friday though I didn't get a chance to use it with the trailer as my girlfriend was hogging the controls

Unfortunately my chain box for the battery didnt work out as planned but the base gave a good platform to secure my batteries and ESC to, version 4 is on the printer as I speak... this time the print-in-place hinged lid has been abandoned.