If you ever get close to a location where these guys are weighing RVs it is worth the time and cost to have your unit weighed. They weigh each wheel (or set of wheels) and then give a great report on what each tire inflation should be. If you have a TT or 5er they will first weigh all points hooked up and then you weigh just the truck and the report gives exact tongue weight. I had it done a few years back at a rally and found that some tires were over inflated and some were under inflated.
http://rvsafety.com/weighing/weighing-schedule
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