bumper pull.......10-15% of trailer GVWR for tongue weight
5th wheel.........15-25% of trailer GVWR for pin weight
Are your posted numbers (900/950/980) 'dry' weight numbers published by mfg.?
I suspect they are as you have only posted 'dry' trailer weights.
Trailer loaded up camp ready........weights will be much higher. That is why you guesstimate tongue/hitch weight by using the % of GVWR so that you can match it to what your tow vehicle actual payload capacity can handle
Payload-------tow vehicles GVWR minus actual camp ready weight, paying particular attention to rear axle/tire load capacities.