Interesting question that I only have a small clue to. My first Coach had the pivoting head and once on a good slope, I was on the edge of a patio, the piston was right at the edge and it slid the pad all the way off and the piston drove into the ground like a stake. Not possible with the fixed pad. The other problem could be, the angled pad puts a lot of stress on the piston in the direction of the lean.
I am probably all wet, and the thought process is not what it used to be as exampled below.
My neighbor kid asked if he could wash my MH for extra money, I said yes, he broke the Remco Mirror off. Stripped the screws. Spent 2 days and 50 miles going everywhere looking for larger screws to no avail. Had to have slotted or Philip's head because it was countersunk and lags would not work.
Frustrated, I went out to take another look, moved the mirror 1/2 inch over and drilled new holes and used existing screws, filled the old holes and the mount covered the old holes anyway. The moral, sometimes you can't see the forest for the trees!
2005 Safari Cheetah 38PDQ - 2009 Ford Flex
Me (Gatogonow), The Boss (DW), Honey Bunny, Maggie May and Mollie Kay (The Gatos)!