i am not surprised. That is a big popup camper and fully loaded is close to 5000 lbs i.e. 3721 lbs dry + 1278 cargo = 4999 lbs and tongue weights should range between 10 - 15%, so 500 lbs is right at 10%.....
and the more stuff you put in front of the axles - the more that tongue will weigh. Where is the fresh water tank? was it empty? if it is in front of the axles and empty when you weighed it then you can be even a bit heavier on the tongue if you decide to travel with it full - something to think about as well.
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
We spend alot of money to go sit in the woods