We had a 2011 "shorty" (33 feet long) Carriage Cameo with 4 Big Foot independent auto leveling jacks. That included the 2 front landing gear jacks. Worked awesome!
We traded that rig for a 2014 38' Lifestyle LS36fw. It has only 4 jacks including the front landing gear. It works great with no issue and will easily lift all four wheels off the ground.
The big Foot system is robust and is used on many commercial applications. I think the number of jacks depends more on the trailer frame strength, length, and the capability of the jacks.
We don't have any issues with movement in the rig while parked with the Steadyfast system that we installed. Virtually eliminates and shake.
Good luck in your search. Phillip
2014 Lifestyle LS36FW
2013 Chevy 3500 DRW 4x4 Duramax/Allison