800 lb ccc is not enough IMO. Water in the tanks weighs 8.3 lbs/gal. Are you going to trevel nearly empty? Loww ccc indicates a lighter build that could prove less durable.
Keep in mind also that the "18" is the box length. Overall length is what you look at in terms of stability with a short wheelbase tug. You should use a properly set up wd/antisway hitch like the Equal-i-zer brand or Blue Ox Sway Pro, V6, right? Keep it at 60 mph or so on the flats, and slow down on long or steep grades.
Edit: 18TO is 1200 lb ccc, not so bad after all. 22'9" overall length.
