Your current battery is way too small. Your proposed 100 AH battery is still too small. If you truly want to be "energy independent" as you say you should be looking for several hundred AH of capacity. Weight really isn't an issue here as I see it. Even 4 6v GC batteries will only weigh about 400 pounds. This is "nothing" compared to the total weight of your rig. Unless you are trying to get buy with a marginal tow vehicle which would also be a bad idea for full-timing.
4 GC batteries will give you about 220 AH at 50% discharge for about $400. That's more than twice the 100% capacity of your lithium battery. What does it cost?
