My recently purchased sob has no leveling jacks of any kind. I want some. Any advice on what kind to get and where?? 90 Discovery, John Deere Oshkosh chassis. I think I would prefer mechanical, I'm sure electric or hydralic are $$$$$.

Simple and cheap, the scissors-type levelers sold by rv suppliers for about $90 a pair (I think). I use an electric drill motor to do the cranking. They will raise the front of my 28' by 6-8". The rear I use for stabilizing only.