Every one of the best runners in the world slow down and walk at some point. Trail runners are largely targeted toward the ultramarathon crowd, and some are better for walking than others. Salomon rarely has durability issues, their squishier trail runners like the Ultra Glide aren’t great for walking gait and the foams wear out, but their harder foams like in the S/Lab Ultra 3 or Sense Ride 4 will easily last a good 1000-1500km (running) unless you really have a weird gait or something.

But for hiking and walking around I'd really look at the Salomon X Ultra 4. It comes in a low or mid version, that's up to you. But it's consistently one of the best technical hiking boots in the world and is not unreasonably priced. Something like a Hanwag may be more BIFL, but I think someone with your use case would see just as much life out of the Salomon. Additionally, the Salomon has a hard plastic chassis in the midsole which is used for stability while carrying extra weight which sounds perfect for your size (they're designed by little 70kg Frenchmen)