I tried the Sv13f but one split outright, stretched too thin. The others just didn’t seem to fill th tyre properly, it sounds daft but at riding rpessure I could feel a difference in the sidewall, like the tube was pushing unequally on the outer. That might not be what was actually happening but it was weird. So I kept them for emergency spares. Same with DH tubes.
Tubeless is seriously worth looking into. Yes it’s a faff but it’s a faff on your terms, in the garage or the garden with tunes on and a beer, tubes are a faff up a hill in a rainstorm. And inflating tubeless tyres with any sort of portable pump is crap. Fatbikes live and die on getting the pressures right so the less compromise the better.
Mudguards, I have a mudhugger fat front and 29er rear. They are hideous and the front didn’t fit my bike at all (it’s got a square crown design, rigid fatties tend to have rounded crowns) so I had to heatgun it right out of shape, not impressed at that. But they do work. And nothing throws mud like a fat tyre.