Nothing wrong with the v10s, They run within a couple ft pounds of the 7.3, forget the 6.0,6.4 those are nothing but a pain in the ass, extremely poor mileage also. Around here due to the EPA Diesel fuel is a buck or more a Gallon than the Gas. There are a lot of the 6.0,6.4 used on the market, dealers think they are gold, more like white metal. 5.4 decent engine but not for your use. I have a 99 2 valve v10 ( 3 valve is better) in a f350 (9300#) reg,cab auto 8' box, 4.7x rear end and a 06 f250 3valve 5.4 extra cab(9100#) 6'box, 3.7x rear end. Mileage is about the same. When pulling my 5t trailer with the 5000# worth of ss on it there is no comparison. The 5.4 is working hard, the v10 doesn't know its there. A fair share here is the difference in the rear ends of course. This time of year the 350 goes out the door for snow plowing with 3600# of salt in back Salter and custom bumper about another 600# and a 1000# of plow on the front, Its as happy as a pig in a wallow on a hot summer day. Never have a problem with break fade just kinda peels the road up underneath. Breaks are larger on the 350 than the 250 a lot of the other components are the same including the frame. The unbridled enthusiasm of the EPA has dealt a death blow to light diesel in the US, These are the same fools that have stuck us with the ethanol fiasco ( frickin wasn't worth squat in the 30's either, smarter people back then, just like the 30,s it drove corn prices up and everything else as well, it died out).