Good points from guys who have humped rucks. Refreshing change from the children at other sites. Hill Peeps are legit gear makers and users. I agree with them about short back rucks and weight transfer, to a point. I know this has been the consensus of opinion, and no doubt the impetus behind trying to adapt internal frame rucks for military use. However, if you are in a hot weather or jungle environment, which is not conducive to chest-mounted gear, not to mention BA, then you might consider the classic "LCE" type system, aka a belt and suspenders type set up. If you do use a "belt kit", then a good "short back" ruck is essential to work with it. Which we all know does not have a real hip belt, like a good internal, to allow you to re-balance the load, from shoulders to hips. So what to do.
Here is one solution. For your consideration. To start with, you need a Brit style belt kit. By that I mean a lightly padded belt (from 3" to 8" in width), with some lightly padded suspenders, with 4-6 attachment points. To this you add your pouches. Typically anywhere from 2-4 rifle mag pouches, and 3-4 sustainment pouches, which might include canteens, brew kit, folding stove, food, IFAK, etc. Typically no pistol gear for a woodland/jungle environment. Now the kicker is that all their pouches are mounted flush with the top of the belt. Sounds too simple to work, but now you actually have a belt kit that works with your short back ruck. The rear sustainment pouches create a nice shelf for the ruck to sit on. Instead of US canteen pouches, with the caps sitting up high and interfering with the ruck frame or lumbar pad.
To this we add a good short back ruck. For my money that is an ALICE or ALICE derivative. But there's all sorts of new things to consider. First of all, I like the new DE 1606 frame. If you have loads under 55 lbs, and not jumping it in anywhere, then this is a good choice. Next I like a good bag with additional external pockets, tailored to my needs. And finally the suspension system. I like medium padded shoulder straps, with sternum and top load bearing straps. I like short, medium padded lumbar panels, like the classic ALICE, in lieu of a padded hip belt. The reason for this being I don't like a "belly band" from my ruck, which does next to nothing, as far as helping to bear the load. Instead I prefer to rest the bottom of the ruck on top of my belt kit pouches.
Now, there are two ways this can actually transfer weight to the waist line. By using a good two-way adjustable buckle, you can cinch the belt kit down tight to the hips, which will then pick up some weight from the ruck. Critics have noticed how this can push down in the back, and raise the belt in front. While true, this can be overcome with a good padded belt, cinched up tight, and 6 shoulder attach points, which helps to spread the load and keep the front from rocking up.
The other technique is something I've been experimenting with. You take two 1" straps, running from the lumbar pad sides, to an attach point on the belt itself. Pretty much right where the lower stab straps would attach from the bottom of the bag on a good internal ruck. So yeah, it's pretty much two extended lower stab straps, which pull the bottom of the ruck in, tighter towards the belt. If the belt kit pouches provide a good shelf for the bottom of the ruck, with these straps you essentially have made the belt kit into a hip belt for the ruck.
If you rig your pouches Brit style, which means the pouches are right behind your hip point, so you can kneel, or prone out without them getting in the way, the load stab strap will sit basically right above your mag pouches. I use a short length of 1" webbing, angled about 30 deg or so, with a female SR buckle, sewn on both sides of the belt (or if you're not using all the attach points on a Brit style rig, you can use the two extra attach points for this purpose). From the lumbar pad, I sew on two 1" straps, with (adjustable) male SR buckles. On a std ALICE or Molle (or FILBE) pad, the wider waist strap can be cut down and used as a base to sew on the reduced 1" webbing.
Now after donning the belt kit, and cinching up the belt, don the ruck, with all straps loose, and buckle in the side load stab straps. Cinch in tight. Now cinch up the shoulder straps, and top load stab straps. And sternum strap if used. This will set the load up with the belt taking up as much load as possible. It might not be as good as a big padded internal frame belt, but it works.
With a good suspension, that has top load stab straps, you can now shift weight to the shoulders, by loosening the bottom stab straps, and even the belt kit, while cinching up the shoulder straps, and/or the top load stab straps.
So I would argue that while not as good as a good internal frame hip belt, it does work, for guys who need to carry both a good belt kit and a full sized ruck. It is the only system I have found that actually works.
Now granted, there are those who live in mountain states, and do things differently. They may prefer internal frame rucks, and chest rigs, and possibly even BA. So yeah, terrain and situation.