Question...... I have a 99.5 350 nose down... I like The idea of being able to adjust the height of the front to be level when hooked or unhooked to goose necks enclosed trailers etc. Will a front air bag give me this ability? How many inches will they raise? should not need more than 2.5.. How often do you have to add hour if you have a manual system without the built in pump.Thanks for your answer............sorry SP