I have the same issue regarding power boxes at hotels on this area, they are home made and awful. These are top tier 4 star hotels too.
Our three phase distro was bought from another production company that closed after the owner took ill. It uses a commercial load center but it's built into the back of a birch 5/8 case that is a piece of furniture. The front is all 19" rack panela with cams, twist locks and Edison outlets. I have used it with big bennies, fairs and in theaters all over town. We have been inspected and complemented. All our feeders are soow and we have the rubbber quad boxes. It is all mainted well.
Before we stepped up to the three phase we got many miles out of spider boxes. They are around 1000 bucks and adapt 50 and 100 amp single phase 240 to 120 individually protected circuits. If you are working venues that provide this power these are a great investment.
SOOW lasts longer and coils easier, it's worth the investment. Make sure to put trick line on each and tie them up. There are videos online that show you how to stitch the line to the cable.
Good luck!
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