It would be acceptable if set up on a stand that the panel was mounted too.
I made something similar out of an 800 amp panel board, I welded up a stand on wheels so I could roll it around. I would say the hole thing with the portable power cable was 800 to a 1000 lbs.
Bob,
It is 'cool' to be able to do things, when you want, where you need.
I am sure nobody asked to borrow the half-ton receptical box !
I locked a 20 foot chain through the 'D' handle of a large hammer-drill, once.
Nobody every wanted to borrow it.
Why do old electricians talk about things in the middle of the night?
Guess the spark of an active life still glows in the dark!