Truck will be pulling heavy loads on gravel roads to fields, pulling triple axle sprayer trailer. I am curious if W900 would not be a good choice because I was told it does not turn well. I am interested in it because I have talked myself into thinking the cabs are tighter and think KWs may be just a little better qaulity.(maybe a little cooler then FL or Volvo).... I have found a nice 2004 with ISX, 72 in sleeper, with 18spd.  Asking price is 38,000.  The sleeper is handy for storage, and the long wheel base should help ride,is why I was thinking with staying with sleeper trucks.   In the past have had FL 120 and an Eagle, it seems money wise the 379's and w900's are more money but not significantly more.   I did try a short daycab 378 and could not stand the ride, sold it as quick as possible.   Currently running 1998 9300 eagle, great truck but M11 motor has its hands ful, by the time it gets up to highway speed its time to slow down for towns(several miles). I really would like input on ISX, is that prior to emisions? Budget wise I would like to stay in the 40-50 range and avoid emissions. I am open to all makes, just really want the best truck to get the job done.  I do spend all summer in truck and sprayer, so after ten years just looking to upgrade a little.  TIA

p.s. sorry for choppy sentence, trying to type and help with kids