[psomers]

Richfaa I think you did your part on getting information from the horses mouth. Can't do much more than that. Every one will have their own ideas and I will give you mine. I think Dexter wants at least 45 lbs to prevent any movement between axel and springs but no more than 70 lbs to prevent u-bolt over stretch.
As for the wheels being off the ground or not, every one with any maintenance knowledge will have their own thoughts.