@Stu_Barnes this post was inspired by jean merciers comments.
I think you said you used gopros. They overheat, you need to have some form of cooling and a big external usb battery to make them run for a long time.
But I hope you record using proper microphones. I suggest a dynamic microphone with a cardioid pattern to filter out some noise. A shock mount to remove vibration from getting to it. 2-12" from your mouth,
I assume you use some form of mixer.i would make sure it has a effects chain, ideally by microphone. high pass filter, de-esser, noise gate, compressor are the bare minimum in my opinion. A noise gate keeps each microphone off until a person talks and that removes a ton of noise. A high pass filter can keep a lot of room noise out. De-esser to make voices sound more natural. And a compressor to keep the voices level even if they move away from the microphone.
And then bring an moving blanket. Hang it on the wall for super cheap improv noise treatments.
This helps you avoid doing so much work in post.
Or maybe you're already doing all of this. But if not, its really worth it. Over you get going its a 5 minute setup.
I've mostly used digital stage mixers but I think it's overkill. 32 channel mixers aren't what you need. I looked up some prosumer stuff and the rode procaster ii has at least the software filters and seems easy to use.
I'm a big fan of the behringer x-air line but then you're chugging 40lbs of kit and the learning curve is high. I don't think you want to do that.
I stash everything into a pelican box with foam. Cutouts for mixer, microphones, microphone stands, puff/wind filters and cables. Tight and compact travel package.
When I worked as a sound engineer I would have a trailer outfitted with amps, speakers, cables, power if I'm at a sports event, and pelican boxes with mixers and microphones. Stands in a compartment for stands. But this scales down well to a compact 4 microphone setup. It's been been many years since I was a pro in the field but a few years ago I had to help out in two big events and nothing has really changed. It's the same filters, same type of microphone etc. different and more digital but ideas are all the same.
Ggood voice sound is hard to create. But lovely when you get it. The better you can get the source to sound great at time of recording, the easier it gets in post.