Hi Adam:
I will answer two of your questions.
1. You can run your fridge using the spare battery for about 4 hours.
   Remember that this battery will keep things inside the fridge cool.
2. If you want to keep your pop-top pristine white, use the regular Clorox
   diluted in proportion of 1:2. When you clean the pop-top with Clorox do
   it in an open area and don't mix it with detergents containing ammonia,
   this creates toxic vapors.

Good luck with your Westy,

Angel
78 Caribbean Westy
85 EcoVanagon GL