The dollar store is your friend. Ant traps for every outside compartment and where the cord goes if it's not a plug in type. Fabric softener, cheap really smelly stuff for the toilet between uses it seals the toilet drain smells good and keeps stuff from sticking to the tank walls. We uses 3-4 cups every weekend. Little bins and baskets not to mention some tools. Rubber matts for the shelves and drawers to keep stuff from moving around and quiet. Thermometer for the fridge, freezer and oven. Ceramic tile for the oven put your pan on it when you put the food in the oven it helps slow the burning process down. The tile goes in the same time as the food. Camper ovens suck by the way but can be useful with practice. Longer times lower temps seem to help also.
On and on and on! Oh yeah enjoy!
One of these or similar to know where your voltage is