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$5 plastic window kit will get you through long enough to save money to buy a new window. Also, that looks like a single-pane so it sucks already and you should have a window kit regardless.

Also also, with a single pane a crack really won’t meaningfully change the insulation properties, so you probably have another issue you need to resolve for why you room is cold.

No insurance company is scrolling reddit looking for months old posts to pair up with a current claim for flood damage... that may or may not have enough identifying information to link to their client. Lol, wtf man, you live in a paranoid world.

Incorrect, I have no personal sensitivities discussing trailers. Thin walls, trailers, and solutions can be discussed thoughtfully. I don't believe the op of this thread was being intentionally hurtful to anyone, especially me. In fact, assuming positive intent is why I wanted to speak up about how the comment could be perceived, especially since the original OP is working on a trailer.

My place just put some silicon for bathroom around the bottom. Apparently how you do it here.

No

Looked for crack on toilet jokes and was disappointed. Sorry, I've been drinking

It’s set with mortar and then grout is applied between the tiles. You can use a product like grout renew to revitalize the old grout, it comes in many colors and last for several years.

I understand that you have some personal sensitivities to people discussing trailers that is outside the realm of discussing the details of structures, but please remember that this is a thread about a structure with very narrow walls and how to deal with changing a window in said structure. No one here was trying to hurt you or demean you in any way.

Thanks so much for your reply! Here's a closer photo of the tile itself. https://imgur.com/a/TCDUany

New toilet.

Tile isn’t laid on grout, it’s laid on thinset mortar. This is called quarry tile. Can you get better photos of the grout you’re dealing with?

Also, if you're buying a toilet pick up a new wax/etc seal. You will need to replace that with the old one

my bad, wrong video, I was at work. From the outside: https://www.youtube.com/watch?v=ISmYpOQHPSs

Where is it located, exterior wall access where you could punch through? What part of the world are you in? Fart fans are not made for static pressure so when you shove a bunch of air into a small 3in duct it can't push it. It would be best to have a decent fan and 4in duct but if that's not possible downsize the fan. What fan did you install? What size is the bathroom?

I had a votens tank crack open on its own and cause serious water damage. Is this brand known for this?

If you're weird about using rebar through the entire thing you could use 8" exterior wood screws and attach them to each other that way

It should stay well-hidden unless the wood rots away entirely, but you could use 3/4" steel pipe and pipe caps if you wanted to keep everything inherently smooth

Whenever I sit on the toilet there is a crack above the bowl but when I stand up and wipe the crack is gone and the I pull my pants up so nobody can see the crack

Rebar stake the first layer of timbers down, then secure the second layer over top the holes however you want, 10" spikes or GRKs or whatever you are comfortable with. Not much works better for the price than rebar for this kind of thing though. You could also set both layers, drill through, forstner the top of the hole larger, rebar them together deep, and glue a plug over the top.

This exact issue is why we ended up replacing our old toilet.

$400 toilet or $85k in water damage repairs. Buy the new toilet :)

Why not use the rebar in a slightly oversized hole, and then pour epoxy down the hole?

This will lock the wood to the rebar, and also prevent the rebar from working it's way out of the wood. And even if the wood did somehow rot away, the rebar would be encased in a "tube" of epoxy and be unable to damage anyone.

A lot of comments about flooding if the toilet breaks, which is great, but OP, I'm begging you to replace that toilet if it is cracked. Sharp porcelain will cut through your body like butter and people have been seriously injured (or worse) by being on one of those when it breaks. Image search will show you some horrifying accidents if you ever want to see what a broken toilet can do to you, but I don't recommend it unless you have a strong stomach.

You could pound some wood stakes into the ground next to the timbers and screw them into the sides. Ideally use pressure treated if you want it to last. I am not sure if they sell pressure treated stakes, but you could make your own if you have a table saw.