as a follow-up, i did cut up an s10 upright to press the spindle out of, and my trailer project has begun
started with a freebie pop-up camper with a family of mice in it, stripped it all down to bare frame, and made a "subframe" which the entire suspension assembly bolts to, which in turn bolts to the frame of the pop-up.
well, here are the plans


suspension started with cutting/pressing out the dead spindles from a junkyard chevy s10.

then i turned some 'adapter sleeves' to press the spindles into, and then 'adapt' to a more convenient OD to slip into a standard tube.

and then welded up a subframe and control arms


and look, assemblage

aand now it rolls on its own wheels


need to turn some spacers and then i can bolt on the shocks, leftovers from a previous project

and then i can start the woodwork.