Portable, collapsible *standing* desk for laptop?
I've been trying to find one of these, or a design for one. I've found collapsible desks, but they're sitting height. I've found standing desks, but they're not good for stacking/carrying in a full cargo area. They also don't look suitable for setting up on possibly uneven ground.
I travel from farm to farm in my work, and I would really like a secure place to put my laptop in order to work on it. My back is in bad shape, and so hunching over to use a typical desk/table-height surface is very painful. I need the surface to be about 45" high. I bought one of those "attach to tripod" laptop mounts, but my laptop is too heavy and it wobbles even on a tripod that is well-epoxied and solid (see image). I have a TV tray table but it's definitely wobbly, and it seems extending the legs would just make it worse.
On some farms I can leave it more safely in the bed of my truck, so I would love to have a "desk" that can sit securely at about 20" and also extend to about 45" (ie, retractable legs); I carry quite a lot when I go to a farm, so it would be great to have just one desk that I can use in and out of the car. (I would really have loved for the tripod to work--not that it would have retracted once I epoxied it to keep it from wobbling anyway.) I can live without this, though, it's just my current Holy Grail.
What I really need is something that folds, is easily carried (by someone with a bad back--no more than about 15-20 lbs), and will hold a 17" laptop at about 40" tall, without wobbling and on a surface that may be somewhat uneven. I need to be able to pull it out and set it up right away, without taking time to screw legs in, etc etc. Oh, the smaller, it is, the better--these are farms, there are animals moving around, the work areas are often cramped, and I'm clumsy. It's better to have it able to be out of the way and small such that there's less chance something will bump it and knock it over.
I have been pondering modifying this to the right height:
but am not sure it will be stable on possibly uneven ground--or even on a flat ground, if it's made taller and narrower--or that I will be able to carry it at that height. It might be too much material, too heavy for me. It might be too bulky.
Maybe something made with telescoping metal pipe? But I don't really know how to do that. I'd love a flat surface on top, and strong heavy legs coming off it--simple and not bulky--but would it get be able to fold up small enough to transport?
I wonder if I could modify a roller stand (like this) as a base and put a flat surface on top of the post--it would even be slanted at a nice angle for typing, I think, as long as I put a stop across the bottom of the surface to keep the laptop in place. But I also don't know if that stand would wobble on an uneven surface.
Anyone have any ideas, suggestions? Directions to explore? Link to plans I can buy? I am kind of hoping to not break the bank here, so it would be great if I could build something rather than buy an extraordinarily expensive pre-made item.
Definitely if I can build something decent I will take pictures along the way and make it into an instructable. It seems like this is something that ought to be out there.