re: It all have to do with bearings...
and gee loading. If their smart they will have I two suits as IVA requirements and EVA requirements are different and compromised suit like used in Apollo is a loser.
See if you can handle a single suit design solution...take four pieces of 2.5 cm square aluminum tubing, put this on a hard floor about where your shoulders and hips would be. Place over this an a camping pad (the blue foam stuff) now lay down on this so you have the tubing under your shoulders and hips and have a couple heavy people or more stand on your chest and hips. Have them do this for 8 minutes or so...