I agree the truck will turn tighter---you will still need the same radius to turn around the boom is the boom and it length as your limmiting factor
your right and wrong...take a one foot ruler,, pin it at zero inches,, spin it around...makes a 24 inch circle... take the same ruler,, pin it at 3 inches,,18 inch circle... pin at 6,, 12 inch circle... you are still turning the same ruler !!!
it's all about wheel base and over hang....you can turn a tigher circle.. but you need to know what the back end is doing at the same time....
i stepped it out today...
from the front bumper to the tip of the boom 30 ft
from the font bumper to the front axle 3 ft
from the front axle to the rear axle 15 ft
from the rear axle to the back of the chip box 9 ft
from the back of the chip box to the tip of the boom 3 ft
i've got 9 ft low to the chip box 12 ft to the tip of the boom swinging behind me...
i'm just over 40 ft with a chipper...a lot of times there isn't enough room to get the truck and chipper in....
with out a chipper,, i can get that truck just about any where.....with a 15 ft wheel base....