theres basically two types of cranks,
this type : that uses a small 1 1/2" thread

and every other crank - wether it be a MTB crankset or a 3peice crank set - they all use normal sized pedal axles (those pedal axles being the only other size).

so, yes DMR pedals will fit truvativ cranks, ive got a few sets of DMR pedal and a set of hussey's somewhere aswell and they are indeeed compatible.

Yep they are, but make sure wen you buy the V8s there not the BMX ones.  It'll be hard to do an due to the fact there impossible to find.