Suburban GVWR---8600#
4:10 Diff....GCVWR----19,000#
Max Tow (GCVWR-GVWR)--10,400#
Of course Max Tow Rating is a mfg. magical number reached using a 150# driver and 20# cargo.
You will need to subtract ALL passenger weights, any stuff being carried in vehicle etc.
That 8000 'dry weight' trailer........what is it's GVWR? It's 'CCC (Cargo Carrying Capacity)?
Figure 13% for tongue weight
What you should do is load up the 'Burb' camp ready.....everybody, everything that would be in 'Burb' when you go camping and go to a set of CAT scales and get weighed.
Front/Rear axles....Total.
Then you will have some real numbers to work with.
Subtract Total from Burb GVWR And that will show how much weight you have left for payload (hitch weight plus tongue weight of trailer)