What is the best safe for a TC?

We bought this gun safe https://www.amazon.com/gp/product/B07LBC4YL4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

It is large enough for important papers also, 3 ways to unlock, has a cable that we attached to a big eyebolt in the bottom of the camper pantry. We move it into the house to its own eyebolt in our master closet. Works fine for us, not too heavy.

As an alternative consider a “console vault” for your truck. These provide pretty good security and the one we installed was very easy to put in.

Just google “console vault” for options

When I was a fulltimer I carried all my important papers, passport, non-electronic tax records, etc. I found two extremely well hidden areas for storing this paperwork. I would not have had room for a safe or anyway to hide it. A safe might have protected against the risk of fire damage but would have greatly increased the risk of theft.

I've been using file safe placed on the back floor of our SuperCab.
It is light enough for me to carry it in and out. Maybe not extreme safety, but I figure out nobody is going to deal with truck alarm and walk away with it in day light.

I have one fairly small fireproof safe we used before we got our gun safe but it is as thick as it is big with no handles..There's really no way to secure it..When we had the fifth wheel and travel trailer there was plenty of room to hide and secure a safe,not so much in our truck camper..I'm thinking either really small for the pull up cabinets next to the cabover bed or something anchored in a closet...Kinda lost on this one..

I think any true safe would be far too heavy and take up too much space. The pistol safes like gunvault are “ok”, but they still take up a lot of room. I think the best option is a combination cable lock run through a solid D ring mount would be the best solution for most people. Any prepared thief to easily defeat any safe, so I think it’s best to focus on the casual thief. I’ve used all, but like I said, I lean toward the cable lock.