I have just had a set of Bullseye leveling jacks installed on my 30' 1987 Holiday Rambler Class A. (Installation done 2/3 days ago) They are fantastic. Completely motorized (not hydraulic), and I got the retracting type, which pull up into a "stowed" horizontal position. The system is completely automatic. There are a number of different jack lifting-weight and length options.
Mine were installed on a Chevy P30 chassis. These retractable ones are attached to the BOTTOM surface of the frames. The front had to be installed forward of the front wheels because of normal location (right behind front suspension) impediments. The rear jacks are in the usual place, just aft of the rear spring hangers. After calibration - to tell the system what is coach-level - the leveling process takes about a minute from stowed to level and shutdown.
Their Website is: http://www.bullseyeleveling.com/
Brian K7ZRZ
Currently residing in Tacoma, WA
1987 30' Holiday Rambler Class A
GL1800 Goldwing - Honda Helix Scooter
2000 Silver Miata LS Toad
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