monos?

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what technique do you use?

i can pull a mono/wheelie for max 3 pedal revolutions.....

i ride a VT

wonder if a DJ/FR hardtail would make it easier?

I can get ages on my XtC...its harder on XC bikes as you have to deal with longer stems and chainstays with high stand-over hights but its not impossible to do.
Try initially standing up then sitting down...i used to deliberatly pull up too hard so that you fall off the back (remeber to hold on!)..that way, you find your "sweet spot". Its just a matter of practising and trying to find that point where you are balanced.