You remined me another point about mobiles that was on the tip of my tongue...bigger coax cables tend to have a little more physical durability in mobile applications.
Well, I run solid core where I can, not through vent windows or doors of course. I’ve ran LMR400uf in mobiles before but it was really overkill and pointless in my opinion. Started using 240 and haven’t looked back. Now if there would be a real need for the 400, by all means, drag out the spool and here we go...