The 20 gal adds 167 lbs, the 40 adds 334 lbs, water htr full adds 50 lbs. We haven't yet advanced to that primitive camping status, so we only do semi and full modern. I travel with everything drained. Besides, I'd be at or over the axle weight max with a full load of water. If I had the 5200 lb Dexter axle and 15" tires I'd be good to go though. The new 2720's are so equipped I understand.
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