You can start by adding a 12V port back there, then plugging in an inverter when needed. There are 12V ports that have a cover that leave it looking nice and clean when not in use.
My concern would be the weight of the cable, and voltage drop along it with the high current required to power a 15A power tool. You would have to run the line right from the battery, get a 2000W inverter for example and pray your lines don't melt or you don't burn out your saw motor because there ain't enough juice to get it to spin. Marg blender should be no prob. 10" skill saw, not going to happen. Mr. generator would be needed for big loads.