Southern,  if been in the sun their whole life,   can have    crispy interiors,  and  paint  issues.     I've seen  less  issues with electrical  in   non rust belt trucks. 
But,    seems like when you drag  one home into the salt belt,  they rust  fast.  Makes  sense...    they've been sand blasted   clean in  prone areas..    in  3-4 winters,  they'll be almost as bad  as  one  that spent it's whole life in the salt.  

I just flipped  a rust free  20 YO   Wyoming  bucket truck  w/ 150k miles,  and  11k  total hours.      Service trucks  just   run a different  life.