XLR Viper 305V12 cargo capacity
My recollection is that the warning sticker in the garage gives the maximum weight that you can ever put in the garage under any circumstances. (Mine says 2,000 lbs). The yellow sticker on the side gives you the maximum cargo weight of your trailer as equipped. So if the maximum loaded trailer weight capacity is 13,900 lbs (per Forest River specs), and your trailer weighed 12,400 lbs when it came out of the factory, you would have 1,500 lbs of cargo capacity on your yellow sticker.
I don't have many options on my trailer, so my yellow sticker shows about 2,900 lbs cargo capacity. If you have lots of options (generator, extra AC, fueling station, etc.) it can really eat into your cargo capacity.