You are in the correct Forum, under the correct topic. It must be that the distance from the bunk to the ceiling is less in a Navion than it is in a Minnie Winnie. I have noticed that when there is too little vertical clearance from the bunk to the ceiling, ingress and egress becomes very awkward.
When I was looking at used motorhomes (before I bought my 22M) I looked at a class C with very little vertical clearance in the overcab berth. On that, I had to use the ladder, and slither both up and down. On my 22M, I just step on the Dinette cushion, and jump-up (or jump-down.)
Perhaps you could get something as simple as a rope which could be anchored to the center & forward-most portion of the bunk plywood, and you could use that to help ease yourself down?
Does anyone else with a Navion or View have this problem?
2019 Minnie Winnie 22M on an E-450 frame