okay first of some links for ya:
here is how i train at the moment:
http://www.testosterone.net/html/133per.html
If you cant be bothered to read it........i have one day for both squat/deadlift, where i build up to a one rep maximum (100%) in a movement that uses the same major muscles as a squat and deadlift........in the case of powerlifting(where less quads are used than body building)......hamstrings lower back and glutes. the main movement will be a variation of a "good morning" other weeks box squats and other weeks deadlifts will be used.
72 hours later a day will be given for speed. box squats at a low percentage (60%) will be used to build up speed.
as for the endurance im not talking over all body indurance. More specifically lowerback endurence. how many sets and reps before your back starts wearing out? so yeah im talking about the backs endurence not the person. as i said my lower back thrives on low rep work, and gets really worn out on higher (8 and above).....but it can heaps of sets. where as my biceps (due to lack of training are the other way around.....they can only be worked in higher rep ranges (10-12) and lower sets (4-5) other wise they just wear out.
as for people working deads and squats the same day:
http://www.deepsquatter.com/strength/archives/korte.htm
that is a summary of the program......i can link individual interviews with lifters that preffer this type of training if you ask.
I do not consider my self "world class" or "super strong" I was involved in the Institute of sport of my country. I had the chance to train as an olympic weight lifter. The sessions would be 2-2 1/2 hours long. overhead, front, standard , olympic squats squats and more squats. then onto pulls, dead lifts, snatch grip deadlifts, cleans, clean and jerks snatchs........over and over again.
I was being trained by an athelete who had one medals at the olympics in weightlifting..........this is how they were trained.