Leveling a MH v/s 5er

All the talk abouut physics and "experience" keep contradicting each other for one very clear reason; different forces come into play depending on which end of the RV you are lifting off the ground and what the tires are doing. The only time that side pressure on jacks comes into play is when the RV wants to "roll" forward or backward. What do tires do? They roll, unless they are fixed (parking brake or wheel chocks). In THIS case, one axle is off the ground supported by jacks and the other is still on the ground supported by the tires. So, IF the front end is off the ground, the parking brake prevents the rear wheels from rolling downhill and putting side pressure on the front jacks, meaning that all pressure on those jacks is straight down (or up?). BUT, if the rear end is lifted, the front end does want to roll downhill (unless the front wheels are chocked or you are sitting in the driver seat standing on the brake pedal), so there is now side pressure on those rear jacks. Bottom line... NEVER lift the rear axle off the ground unless the front wheels are fully chocked.