IMO A vise stand should be anchored or be on a extra heavy bench.
To me the beauty of a vise is holding something in a position and that something is not moving. I want to be able to use a 24" breaker bar or pipe wrench without thinking about the vise moving.
If a vise moves during use, the setup is a failure.
Most of the Pictures here are huge vises. If I had to have a portable vise, I would thing a smaller 50lb, or less, would hold anything for a portable job. If I need a vise outside, I slide my Wilton 1755 (which is all I can, or should lift) into my trucks receiver.
https://scontent-b-dfw.**.fbcdn.net/hphotos-prn2/v/t1.0-9/552801_154998094632124_618644946_n.jpg?oh=61075e9ee30a84b20aa7f4b095895293&oe=5537542D
A few things to keep in mind.
-Kids love vises. Every kid that goes to my barn is flipping the handles.
-Once a 100lb+ vise/stand starts falling, it will be hard to stop it.
-You can only keep your eye on so much with the welding helmet down.
-If no one is hurt, I will still cry if the vise is cracked after hitting the floor.
YMMV
