nice for the crockpot
but 11.9v is under the 50% SOC for most (if not all) RV batteries
be sure to bring them back to full charge before starting the next nights use cycle, you can't be doing 80-90% recharges with that kind of overnight use, or your going to significantly shorten the useable life
you don't need 2000w for any of the listed use
my average load is less than 200w
laptop, TV, portable fans, heat pad (for my back) etc..
but because i like my late night bacon snack
i need a large inverter for the MW
with out the MW bacon, 400w would be more than enough