I also have a 2014 3051S and know what you mean. A couple months after having unit I went to a truck stop weight scale to get an idea of the numbers. 2 passengers, 3/4 tank of gas, empty gray and black tank, 1/4 fresh water and pretty full storage tanks with chairs, tools and other items. After that I have just under 450 lbs until maxed out. That is not a lot of room when you start figuring things like clothes and food and misc. Items. We are starting fulltime very soon ( as soon as house sells) so we are very weary of weight. We also are towing a car with a bike rack, 2 bikes and mobility scooter in it.
Things I have learned so far and have been taught.
Make sure waste tanks empty, carry no more than 1/4 tank fresh water, fill up at site
Do not fill up shelves and fridge with food, either buy the bulk when you arrive or closest town to campground.
Use as much plastic as possible for utensils and plates, they make nice looking ones now.
Do not bring all your clothes there is usually laundry at site or close by.
Do not load up on toys and video games for kids, you are enjoying the outdoors.
I know these seem trivial but when you add them up you easily have a couple hundred pounds. Plus others will have many more tips for you that I forgot.
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