well i have been in the market for a different truck now for a while, i've had some things that im not real sure about though. 1. chasie question would a chevy/gmc 2500 be ok for 400 gal tank of fert or is it too much? would a 3500 be more my style? 2. should i look for a dual rear end? or can i get by with single. 3. are flat beds that much better? this truck would also be used in the winter for pushing, i think a 2500 or 3500 would not really matter in the winter.