[rhagfo]

Well unless you carry a ton of stuff in the TV you should be ok.
It would be nice to get a pin weight for your trailer. If you can get it weighed nearby please provide the calculated pin weight of the 5er.

If you weigh all three axles TV front, TV rear, and trailer axles together, then weigh the TV axles without the 5er. Add the TV axles from the 1st weigh together, then add the TV axles from 2nd weigh together and subtract that sum from the sum of the 1st weigh, this will result in the pin weight.
Then you can add the pin weight to the trailer axle weights for GVW of the 5er.