[hypoxia]

Paul, you are going to need someone with a ZF suspension coach to weigh in on support placement. Most of the conversation in this thread has been about ridewell suspension coaches

Most of the time I do not use a jack.  I lift the coach as high as the air springs will go and place large pieces of pipe cut to fit under the coach.  The front of the coach has a frame rail on each side of the generator with a tow hook on each.  I put the pipe under those rails.  The rear has some framing on each side behind the tag mudflap.  I put the pipe under that.  That works on hard surfaces but I have to put something under the pipe on dirt or grass.

I use the jack when a tire has to come off but rarely otherwise.  I am small enough to fit and nimble enough to crawl through the suspension.  Here's a photo of me using the white pipe while working on my last coach.  The pipe is 5 1/2" Diameter X 3/8" Thick.  Length is 10 1/2" for the rear and 13 1/2" for the front.