Then try your game and make a clean save and try to see if that fixes your issue. Make sure you aren't adding a lot of tweaks to your. They personally destroy my performance and could cause game instability. Go ahead and add in back the tweaks in the guide but leave out the light distance tweak and the grass fade distance tweak. ini files from my Mod Organizer>Profiles folder and then regenerate them. The first thing I would try personally is first backing up all my saves. Though like I said I doubt it's load order causing the issue. However, this isn't something I would really expect new players to know how to do optimally. This is why a manual load order is always the best or at the very least a tweaked LOOT load order. The problem with LOOT is that it it doesn't really account for the most optimal load order and really only fixes the largest issues. It's hard to know with a game like this what could be causing this. Well, your load order isn't the best but it shouldn't be causing a repeated crash on fast travel.

Fallout nv crash on startup