2014 Columbus 320RS with 6 point leveling system - its electric - slower than hydralic but easier to install and much easier to maintain. Works well.
As far as 6 versus 4 - the 4 outer jacks level the camper on both systems, the last to are stabilzers, and I believe are worth the price difference. As far as lifting the whole unit, I do not know if its recommended (I doubt it) but in my learning process it was done.
2013 GMC SIERRA SLT 3500 HD CC Z71 4X4
HENSLEY BDR3 TRAILER SAVER AIR RIDE HITCH
BLUE OX BED SAVER
2014 COLUMBUS 320RS
WAR EAGLE !!