Duane and Greenie, if a 2.5" wand (tubing) is on the cards, it would have to have a separate 'hand grip' with a trigger on it, and most likely on top, as you point out Greenie.
The Stanley wands are of that idea, but as you say too top heavy as a result.
It needs a clever designer to discard the ideas we as carpet cleaners would come up with, and venture into new territory.
Something that allows us to go to 2.5" (if that's the direction we are to go in), but gives it an easy grip to reduce the strain, particularly on the wrists.
As well as having the ability to adjust height (say a 3" to 4") so you can fit the wand to your height. This will take the strain off the elbow if it's sitting right.
And a grip that fits the hand properly, so it can be gripped all day long with little hand fatigue and strain.
I have come across plenty of older carpet cleaners that have stuffed hands, wrists and elbows due to poorly designed wands that
compound the effects of repetition of using the wand all day.
Again, the Stanley wand sort of has the idea, but is ham fisted and agricutural.
It needs someone that thinks totally different.
M