You say slipped loops aren't a good remedy but they work just fine EVERYDAY in the world we live in, most folks tying these trucker's hitches are not tying a fixed loop system. If you mean that they're a little easier to tamper with, then I'd agree with that statement. But even then, it would take some pretty boneheaded tampering to goof up a properly cinched down TH...and anybody with common sense knows not to mess with a tie down.
A fixed loop system should be used for a semi permanent TH, like the one I use for tying my jon boat down to the trailer. I use a constrictor at the first anchor point and a directional fig 8 on the bight and trust me, this is arguably the best (securest version) of a TH you can possibly come up with.
Your argument over the CH is very misleading because once it takes strain at a right angle, it's actually very secure. You say you can shake it loose, well sure you can because it's not designed to take stress and pull from different angles, only a right angle. Most hitches are designed to be right angle pulls...very few will properly take pull and strain from just any direction.
Having said all of this, I too like the detailed discussion here and I'm a knot junkie or I wouldn't be here.lol. I still like to keep things simple if I can, just because I know how to tie damn near any hitch, bend or loop, there's no sense in getting fancy if it's not called for IMO. This particular thread is going to impress upon the casual person that they MUST tie their TH with a fixed loop or it's not worth a nickel and that's just very misleading...that's my point. Most people who need a quick TH use the slipped midline loop of some sort and it's perfectly acceptable in the large majority off applications. I know a guy who moved furniture for a living, he tied his TH with a slipped overhand and said he's never had a problem with it...it's how the store manager/owner shows all new hires according to him.