Rust particles in coolant?

I'm kind of OCD when it comes to truck maintenance. I always change the oil every 3,000 miles and the coolant every 50,000, or two years. I changed both yesterday. I've been using Long life, 150,000 mile coolant. The coolant looked pretty clean coming out, but when I flushed the radiator/engine, there was actually a little more rust and crap coming out the bottom than I've seen in the past. I usually do a 70% coolant, 30% water mixture so there shouldn't be much if any corrosion going on in there.

 

that is one thing I have been meaning to look up how to do. I'm OCD on maintenance as well. My dad doesn't like it and told me the differential oil changes, tranny oil etc was a waste of money. I said "Coming from the guy whose dodge broke a front axel, driveshaft, and front wheel bearing (amongst other thing) arounf 60k"