The collapsable tables will do in a pinch. I've tried one in a camp situation, major ground hog hunt.
I went to the shoot with 200 rounds of 223, thinking it was lots, live and learn. It was a drop in the bucket for what took place. This rancher had an infestation that was astounding. Enough.
Anyway, I needed to start handloading on the job. Went into town, we have a great little gunshop in Vernon that is well supplied, Del Selins.
Ran into a fellow there that extolled the use of a BenchMate for handloading under less than ideal circumstances.
He was right, it works, barely. If I had nothing else, I would use it again.
It just isn't rigid enough. I ended up makeing up a top for it out of 2 sheets of 36" x 36", 3/4" fir plywood, screwed and glued together, with two more pieces 6" x 24"screwed and glued to the bottom for the clamps to grasp. I then drilled and counter sunk holes through the top of the cover to match the plug holes in the Benchmate top and bolted the whole thing down tight.
This added a lot of rigidity and weight, but not enough weight.
I ended up putting up another piece of plywood accross the bottom bars and put a couple hundred pounds of weight on top. It was finally acceptable for handloading with a Hornady turret press.
The whole thing, other than the weight plate and weights is still collapsable. Its only real drawback is that with four legs, it needs to be either level or stabilised in some way.
You are talking about being limited for space, liveing in a trailer. It should work well there.
The nice about the extended top is there is room for the scale, powder measure and components as well as the loaded rounds.
There are other issues with loading outside that need to be dealt with, such as wind.