I spent a weekend helping a friend rewire his Airstream Land Yacht. All the tail light wiring had wire nuts. Only half the lights worked. I used a waterproof splice to fix all the connections. But the more we looked around his camper, the more we found.
Wire nuts should NOT be used on DC wiring on a moving vehicle. Sooner or later, they'll become an issue.
I chose to replace all the ones I can find on my rig, at my convenience, while at home, rather than on the side of the road, or some remote campsite.
Here are the terminals I use:
https://www.amazon.com/Connectors-Waterproof-Electrical-Terminals-Automotive/dp/B075TYSD26/And here's one of the crimpers I use:
https://www.amazon.com/gp/product/B0069TRKJ0/My other crimper is an Amphenol Model 59250. These cost over $1K new. I use these in the aerospace industry. I bought a couple of used ones on eBay for $100-$150. For the average person, these would be overkill.
You can be proactive, or reactive. You decide what's right for you.