For any thinking about the HI Lo air ride system...
 

Finally got down to business to change the transmission oil today after putting it off for a few weeks due to the sir line4 from the HI LO being in the way. I called up Aaron and he told me to pumup up the system all the way, put the jack under it and raise it up enough so you can get a 2x4 under the rear tire. Drop the jack back down so the tire is resting on the 2x4. Let all the air out of the system and you can get to the tranny plug. Worked great.