We have a 28 foot Airstream that weighs 8,200 pounds, with 850 pounds hitch weight. I have a 1000/10,000 pound hitch. When I hook up our trailer there is a slight bow in the bars. This is what I did - I went to the local farmers grain elevator and weighed my complete rig. We asked if we could come after hours - so we didn't interfere with their normal business. Then I pulled up on the scales where my hitch was on the scales but not the trailer wheels. I unhooked my trailer and pulled the truck off the scales. Note, your trailer has to be level if it is a tandem axle, or it will mess up the geometry of the weight. That gave me my tongue weight (not exactly but real close). Hitches are sold for a specific weight and a heavier hitch would defeat the purpose. Any RV dealer will have hitches in stock and will be able to give recommendations as to what you need. With our set-up we pull our Airstream 12,000 - 15,000 miles a year from the farmland of Louisiana to wherever we decide to go.
