I have worked her this morning, got about the same results (with her front end). Got some pretty nice side passing though XD . I did get a couple of actual steps out of her, a couple of different times (looked accidental, but I took it) and let her think about it, then saw one good try, though still very stiff about it, and kept nagging at her til she made accidental progress that wasn't so stiff- seems like when she actually trys, she turns into a log. I know she can do it on her own. But this is more or else how it goes, seem unable to bridge the gap. (In the very beginning, I would let her off with trys, stiff or otherwise. I now try to get more out of her, as in, I try to get the correct way out of her) I'm not looking for absolute perfection, I don't mind if her back hoof doesn't screw into the dirt, but just keep her butt in the same relative spot and she's not clanking her front feet together and tripping over herself (I want her front feet moving correctly) for a full 360. That's my primary goal at this point, and then can focus more on getting perfection. (Though I've found if you get the front end moving correctly, the back end generally falls in line and becomes more natural)
So far as flexing, I was still having a hard time getting her to move her neck (as usual) she would bend her head back while keeping her neck fairly straight, she gives a little, then stiff as a board. I try tug tug tug, and all I get is tug tug tug back (I pick up light and then tug, repeatedly) with little (if any) release on her part.
I'm not going to be able to try the trailer til this weekend, but I will let you know.
Btw way, this is the first horse I've ever worked with from the ground up (meaning, I've had her since birth) so any holes here are mine (I accept that). She got a late start with training, and I had never started a horse. I haven't been working under saddle with her recently, since she seemed to have regressed horribly after some changes were made (living situation, she started to get super jumpy, flighty, and just doing things and acting out in ways she had never done before), so I'm more or less starting over with her and making her remember she has a brain and how to use it. (It is also incredibly difficult to do anything under saddle after your horse plows you in the dirt and fractures your ankle... Ugh. I did manage to get back on anyway directly afterward, but I decided since she lost her mind I needed to take a step back)
So, if you (generally, to anyone) have any critique on what I'm doing I am in for the learning. I'm currently starting a young guy who has had some severe behavioral issues, and I'm using any acquired knowledge for him, as well- since if he has any holes, it has the ability to turn bad quickly. (In a perfect world he would go to a professional, but rescues have limited funds, and trainers willing to deal with those things are fewer and far in between- and he's my foster, so it's up to me to get him adoptable and sane, he is doing very well, though) I know it's hard to critique without seeing so I try to explain the best I can.
So far as the trailer, I have a two horse straight load with removable divider (completely open in the back, no bars). It's a large trailer - tall and wide (wider than most horse trailers, more like a stock)- it's primary problem is that it's high off the ground, so shorter horses (15hh or less) have a tendency to want to jump into it (it comes up to their knees), rather than step, and that first step out can be a doozie compared to most. I usually back it up to a higher spot of land or platform initially to build confidence, and after a few goes in and out, they are good for the bigger step. And have no problems, in fact, she's the only one I've had issues with!
This weekend I will (more likely than not) be coming home with a 2h slant (friend is selling it for a good price and will allow me to make payments, mine is just simply too big for my truck to safely haul, so I have to borrow other's trucks) Will be smaller (though its one of the taller types) but shouldn't be a problem. My horse has been loaded into all different types of trailers, at different times of the day and night, and as I said she doesn't have any problems going in. She's slow (not resistant), deliberate. I don't have to go in with her, I just point, she goes, throw the lead over her back and then tie her.
I appreciate all input. Sorry for length!