I'm not saying Johnv shouldn't make them. I know/knew many finish carpenters that used a type like Johns pic, for their work stations. Finish work stations its pretty much all straight down gravity weight and those horses will be fine for that purpose.
However even the finish carpenters made and used the common type I showed when they're used to support workers. Workers create considerable lateral stresses on horses by weight, climbing and jumping up to and from and or moving around each other. Most framers I've worked around build them basically the same way, (some don't build to be stackable) but all with bracing.
I know too many smart people, (I thought they were) who were hurt when their poorly built horses and staging collapsed, too many worker compensation claims and too much missed work.
12 yrs ago one of my 1st employers in the trade and his long time friend and foreman fell from wooden staging, (he never bought pipe or pump jacks) we always built on the job then tore it down and used it for something when no longer needed.
Maybe 14 to 15' high the staging collapsed, sot sure why, the ground was still soft from excavation and landed on both feet, however a chunk of 2X something had sheared off in the collapse to a long point stood in the ground below him and embedded itself from just above the knee deep up into his inner thigh.
His foreman's career ended with a broken back, (2 yrs younger than me). Darrel closed the company. This was the man that scolded me back in 1981 for sloppy staging and said, "You build it as if your life depends on, cause it does!"
Texas maybe not 100lbs, try PT SYP they're lighter around 70lbs a pair wet, spruce lighter still at about 30lbs a pair and just as strong. I also know too many no longer in the trade because they got hurt carrying too much, (clumsy or showing off out of shape and old enough to know better)
We need constant weight bearing exercise to stay strong and maintain balance. I'm not saying for one to try to act like 25 or 35 but when one forgos the aerobic and anaerobic aspect of construction you become a danger to yourself and the others around you at work.
Back in 96 I had a local metal welding shop weld me up one of their racks, (my long time wooden rack recently wracked a bit too much and collapsed as I came to a stop (at an intersection). I had a 1/4 of the deck frame material on it that fell to the side and or slid over the cab and into the street.
The welder had a junk Toyota pick-up sitting on an example of his signature rack at least a yr and more in his compound, (don't recall model) maybe 6500lbs. I said big deal my horses can do that too. My parents have known him and his family forever.
Mr. Vidal made a deal, for every day my horses held the truck up he'd knock off $50 if they collapsed before the 1st day was out I owed him an extra $50. I brought them down the next day, set them on steel plates then he laid 2 10X10 creosote beams on them and fork lifted the truck onto them.
I got a $700 rack for $500 and I'd be willing to bet someone pushed on the truck to force it to fail.
Work smart not hard!
Never bite the hand that looks dirty