I run a Waeco Coolmatic fridge when I go camping, and I have drained the battery (even Optima yellowtops!) on extended trips, requiring a jumpstart. To remedy this, I upgraded to a Diehard Platinum and installed a second emergency-backup Odyssey battery, which is isolated from the main battery with a Hellroaring Battery Isolator.
For whatever reason, should that fail, I also bring a 5000mah 3S (11.1-volt) Lithium Polymer battery (which I run in my R/C cars) that I can connect temporarily to help boost the main battery when starting. The battery mentioned can sustain 200amps of continuous discharge, with up to 250amps of burst discharge.
Note: there are inherent risks to using this type of battery for this purpose, so I don't recommend making a habit out of using LiPo packs to jump-start!