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I've used and abused one like this for 10 years or so without problems (admittedly bolted to a bench) - if you go much bigger then a couple of G clamps probably won't be enough.
https://www.machinemart.co.uk/p/cl-cv75b-bench-vice/
It's also possible to spend silly money on a Record...
Engineers vice bolted to a suitably hefty board - 25mm ply for example.
G-clamp the board to whatever is handy, or hold it in a workmate.