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We let air out before we unhitch the trailer. If you leave air in and then slide out from under the trailer, the hitch could pop to the upper limits (not recommended). We approximately level the trailer with the landing gear, then let the air out of the hitch until we can see air between the pin and hitch, then pull out from under the trailer. Then go to zero. Then finish leveling the trailer. We put in about 55psi once the trailer is loaded. If we left this air in, the bags would always be inflated and the hitch at its highest. Did they not put a line on your hitch to raise the hitch to? Depending on the pin weight of your trailer, the pressure may change, Usually not, but it could. If you air up first, you will have to raise the trailer very high to get it into hooking position. We see no need to overwork our trailer landing gear system. We bobtail with zero air in the bags and have no problems doing it that way.....This is just my way of doing it and I hope this helps.....
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