Any suggestions? heres the updated diagram.

Trying to keep it simple as possible. this is only for weekend usage I will not be living in the van. Battery will be charged during the day driving. Mostly just using to power the heater overnight etc - https://preview.redd.it/qsqbqqtvsf6e1.jpg?width=1920&format=pjpg&auto=webp&s=c4f4d9273069e858224d6b76d30f9e4adccb3bc9