I've had a scout around but can't really find the info im after. I know there won't be a '1 number for all', but what would be a sensible figure.?

Im currently linking my truck with 14" air shocks and ready to weld the mounts to the axle.

There has to be a compromise between driveline angle and castor angle. Its not a DD, but will be driven to trails, sites etc so needs sensible road manners

 

if your linking it why not do a cut and turn then you can get both ideal angles. i run 6 degrees but could get by with less and a better pinion angle

 

Cut & turn?