I sure would make things easy to do. Meaning you need minimum size wire to the battery clips. 12 gauge would do fine. A sixteen gauge power wire is plenty this allows the cords to be wrapped around the box and stowed easily. Use a 3 wire power wire with a ground.
If you're on the road a week every day, wait. When charging becomes intermittent then once a week with the Megawatt is plenty. When floating at home once a month is plenty.
You can tweak the potentiometer to 14.7 and use this thing to faster charge wet batteries too. When a converter or charger wants to lean on a shovel hook the Megawatt up and reduce finish charge time by 90% This really helps when using a generator.