I have a concrete pad and an awning at my land. Here is a pic of the bench I made when we were fabricating it...
Finished the welding, painted the table, then poured concrete in. Weighs 400 to 500 pounds, had to move it out of the shop to my range with hayspikes on a flatbad.
What you can't see are the wheels I welded to the front of the forward legs and the jack system on the rear. When the jack is up, the table sits as it is. When I jack the rear wheel down, it levers the table up in back and lifts the front onto the front wheels, allowing me to move it by rolling around. When not jacked, the table is solid as a rock.
ETA: Also, before welding the top on, we had poured concrete into the legs to prevent any ringing from the tubing.
I wouldn't change much with mine, it is rifle only pretty much. I have just a basic wood 6 foot by 2 foot bench about 30 yards from the berm I use for pistol, but it is nothing special. I was wanting a table for load testing and precision stuff, and the table we built works great for that. If I had it to do over, I would make it bigger.