To be safe and not destroy your LR, you would like to tow no more than about 5,200 lbs max. That would keep you at around 500-520 lbs on the hitch. I'm assuming your payload is probably something like 1,600-1,700 lbs, so a hitch weight of 500 lbs would still leave you some capacity for people/pets/cargo. Our dual axle Kingdom Caravan XL has a 21' box and is 7,800 lbs dry and 9,820 lbs max. So that model would be too big for you. The single axle Kingdom Caravan ATS is the exact size/weight you're looking for. It can be customized for work spaces. For example, instead of a dinette, we had them build a flip up bar table for us that serves as a dining table and workspace for both of us. We don't need the extra bed you get with a dinette and would rather provide our own ergonomic chairs, so that worked out great for us. The ATS is specifically built for rough roads and off grid.