What type of mount are you talking about? An Eyerly mount has hydraulic leveling arms that swing out on either side that are pinned in and then you can level the ride side to side. The big cylinder in the front, if your referring to the lifting ram - lower/raise the ride to level it. It's a design that they had years ago (mine is a 1965) it's the same on a Loop O Plane, Roll O Plane and maybe the Sidewinder. Eyerly was the "bomb" when it came to trailer mounting rides in the 60's! 4 tubs rack on each side and then when the sweeps are folded up, those racks raise up on either side like a rib cage around the sweeps!
The Factory sign unpins and swings down over the front.
Rock O Plane's are easy to move, maintain and they have some height. They were built like tanks and if you maintain them properly they will last damn near forever it seems. I would like to see a Technical Park, SBF or even a Zamperla ride in 40 - 50 years??!!
The operating height is 45' the frontage width is 44'. Those leveling arms (mud sills) swing out to a width of 47'. The depth of the ride when it's in the air is 40'.
Riders can pull the break and lock themselves upside down, it's not as intimidating as a Force 10 or Orbiter.
The Eyerly Mount is a 26' trailer so it can be pulled as a set of doubles.
They don't gross a ton of money but most of us run POP's a lot and it ends up being just another major.