Heavy difficult to move speakers- how do you deal?

I've had good luck with Giant Herbies Sliders.  They allow me to easily move my floor standers out from the wall for serious listening.  My speakers only weigh 60# ( half of yours) and my carpet is low, so your experience might differ.  But it might be worth trying.

My previous post was meant for another 

few ways out:

1. find strong neighbor to help you

2. bulk yourself up at the gym

3. use dollies instead of casters (when you get help or bulk-up)

4. if you have space for forklift, you don't need strong neighbor or bulking up.

Make sure to cyro treat the casters and have them engineered for directionality. 

Wait! There might just be a new market opening up.

Tweaks that Roll, or Moving Tweaks. Caster Snake Oil. 

I really like what @lak said.  Most of mine have a place to screw in already.  But I am little weird about them sitting on casters from a purist standpoint.