Any tips for running meth lab?

I hardly play GTA5 but I thought I'd hop on and my friend was telling about running weed farms/meth labs etc. I bought the cheapest meth lab and went and started it up by getting the lorry.

My mate was telling me that people don't really bother killing you or taking your supplies but when you do the product that's when people try and kill you, he told me to buy the Kuma Armoured? Which i did as having a armoured car over the Skyline is a no brainer.

Has anyone got any tips to run the meth lab to the best as in how to move product without running into trouble etc.

Thanks