You might want to provide a little more info for us:
1. Where you fully loaded with water, LP & Fuel?
2. Anything in the Black and/or Grey tanks?
3. Are you loaded for travel?
4. What are your slide locations? (More/bigger slides on one side will affect balance.)
5. How "good" are the scales you used? (CAT, Grain elevator... I like CAT scales. Generally costs about $9-$10 for 2 passes to get 4 corners.)
6. What are your GVWR and total weight?
7. What are your Front GAWR, left and right side weights?
8. What are your Rear GAWR, left and right side weights?
Personally, I started from scratch.
First weighing was with only me in the rig and full fuel & LP.
Second weighing I added full water. (I did this the same day.)
Third weighing was a few weeks after purchase and my first shot at loading for use and setting tire pressures. It included Co-pilot, 2 100# dogs, 2 dog crates, loaded basement, food and stores for a long weekend, clothes, tools and such.)
OK...I am extremely anal retentive.
It's a curse.
That being said...
I discovered a few oddities in the process. As an example, I returned from a trip with full fresh water and 1/3-1/2 full dump tanks. When I did that I maxed my rear axle exactly at 15,500. PANIC!
Dumped the waste tanks got back 380 lbs but what was odd was that it shifted weight onto the front axle. (those tanks must be behind rear axle.) It also corrected is large L/R rear imbalance.
So, yes...I have spent about $60 in 4 months on weighing. It has been worth it for me because we aren't even set up for full time yet and that is where we expect to be in a couple years. You better believe I will have the next rig we are looking at (Don't care if it is used or new) weighed before we buy. Having only another 380# available on the rear axle will not work for us when that time comes. Tis a shame because we really like what we have too. We just want to carry more than we currently are while we are part timing it.