I went to the local Walmart and looked at the $30 Mainstays table. For the price, it's fairly nice and I decided to purchase the last one they had on display.
However, while it's quite light in weight, compact (when folded), and pretty easy to setup (or take down) it's not what I'd call really good in terms of steadiness. The telescoping legs wobble somewhat and I don't think I would trust putting any single object on the table top that weighted more than about 20 pounds. I'm sure it could carry more weight than that if you spread the load across the table top, but I would never try to put my 35 pound mount head on the table while setting up (not that I'd need to use it that way, but just saying).
It's also not designed to work on uneven surfaces, but it should be okay on grass as long as it's not too clumpy or uneven. The height adjustments are limited to three stops, with about five inches between each setting (so, you can't use those to adjust for uneven ground, unless the difference is that same five inches). I may see about getting some PVC pipe that could be slid over the feet of the table legs to allow for some unevenness in the ground, like a one to three inch extension. Also, with great care you might be able to drill some holes in the legs to allow an extra position for adjustment, so instead of five inch increments you could have one every two and one-half inches.
But like I said, for $30 it's a pretty nice table (even without making any changes).
As for the OP's table, I do have a few questions. How is the table height adjusted and what kind of increment does it allow if you needed to place the table on uneven ground? Also, about how long does it take to setup or take down the table?
I guess I should mention another option (for a table). I'm currently using two levels of plastic, stackable shelving when I'm working from my concrete driveway at home. This produces a nice 34-inch high table top that also has one shelf (or two if you consider the base which sits a little over one inch above the ground). I used a large plastic garbage bag that had been cut along its side seams to make a curtain that goes around three side of the top so that the middle shelf is protected from dew. This "table" will only work on perfectly level ground, but it's really cheap and surprisingly strong (although I still wouldn't try to put my mount head on the top). Here is the type of shelving I'm talking about (Walmart, $15). You also wouldn't want to use this that often with a chair, although I have used the top to hold my laptop while sitting on my observing chair (but most of the time I just stand since the top is at a pretty good level even when standing).
Edited by james7ca, 21 June 2019 - 11:58 AM.