I just found out about OCCC (Occupant and Carrying Capacity). This post and others I have found have been helpful. If I understand how to calculate OCCC correctly then using the above Itasca example where Winnebago provided a 4,000# OCCC. The formula is OCCC = GVWR - (UVW + Propane). If GVWR = 32,350; if propane = (28 gal * 4.2)= 118#; then the UVW (which is the weight specific provided by the manufacture) will be 28,232#.
So now if I look at Winnebago motorhomes I can look at their OCCC label and see the OCCC weight. If I were looking at the Itasca that I used in the above example I should see 28,232. I think this OCCC weight makes it easier to compare carrying capacity. I am assuming most of the major manufactures are using an OCCC label?
I realize that it is my responsibility to not over load. The Journey 40U has huge storage capacity which could lead to over loading. But it also lends itself to being able to manage (organize) your stuff better. For me the OCCC is helpful. The 4,000# is a clear number to work from as weight is added and removed: passengers, liquid tank weights, material additions such as solar panels etc, tools, tables, bikes, chairs, parts, barbecue, satellite dishes, pots and pans, lamps, rugs, screen enclosures, hoses, washing gear, tire covers, jacks, spare electrical cords, jack pads... holy cow the list seems endless and then there is the food, clothing, books, DVDs, maps, radios, computers, printers, decorations, the bag with all the RV owners manuals must weight 10 pounds and there you go I'm over weight. SteveG