I'm not a big fan of ladder stands, strictly because of height restrictions. I like to be 20+ feet high and a lock-on, permanent stand or my self climber, allows me to do just that.

The point made about stepping down into the stand is valid. You must always put your steps 3-4 feet above the actual stand and step down into it. It's not only safer but also much easier. The cables are then not much of a factor. You and your Dad can practice this at much lower heights.

I also use my self climber and cables are never an issue here. Most climbers today are designed to climb in a sitting position. Also very safe.

Just so you know, I hunt from a treestand 90% of the time. I also have a knee that acts up, from too many hockey games over the years and I happen to be older than your Dad. If he can find a setup that he feels comfortable and safe, that would be great. If not, let him make that decision.

Good Luck!