PJcam,
I'm no tripod, or any camera equipment, expert of any kind. But I do know something of mechanical systems and physics. (Ex-ham radio operator that used to design his own antenna arrays. Ex-sailboat owner that used to tune his own boat's rigging.)
It's not just the weight of the camera + lens + whatever, and its not just the force that's in column to the center axis of the tripod. There will be lateral forces, moment arm forces, etc.
These forces may be of
particular import to you, given your constraints, as it seems fairly likely to me you may occasionally, if inadvertently, steady or brace yourself against your equipment?
Would be a shame for tripod, equipment and you to take a spill
This is all something of a consideration for me, too. My balance never was all that great to begin with. Now, with somewhat advanced years, it's worse than ever. And, despite working out with weight training and cardio on a fairly regular basis, my legs just don't have the strength they once did.