[BiggarView]

At the moment it sounds like you have an external battery bank that weighs nearly 700 lbs, add the inverter 55 lbs, cabling and other paraphernalia adds another 50 lbs or more, plus you'll need to reinforce the the floor to support the weight... add at least another 50 lbs. To move it into the Montana, all in, in just the location for your batteries and equipment you are looking at ~850 lbs. plus your solar panels(guessing minimum 200 lbs). Have you figured those numbers in the trailer capacities when you move it onboard? It's not just about what the system will provide for your electrical needs. Not saying it won't work, but do your math on it beforehand to determine if it will work for everything else you might want in your rig. You might have to upgrade the suspension to handle the extra weight.