It takes me a whole year to drive 5k miles. I'm definitely doing oil changes at least every 5k miles. On my 92 FJ80 I'm doing oil changes every 2k-3k miles.
I also plan to do my first oil change at 1k.
I didn't look super hard, but I couldn't find any trays for a cool box. So, I downloaded the 3D model from 2024 Toyota Land Cruiser Cool Box Tray, uploaded it to Treatstock, and ordered one. It (ABS/Black) shipped for $17.13, which doesn't seem that bad.
I'll post some pics when I get it.