I keep it simple.. When I know I am making a trip with the fifth wheel I inflate drive tires to maximum pressure stamped on side walls.. front tires I run at 65 psi...
I see no reason to run to weight scale all the time... been towing for over 40 years with many different rigs...
Weigh one time I suppose... I didn’t, don’t know and really don’t care... I know what the empty weight of the 5er is and I’ve got a few thousand pounds of gear in the fifth wheel..
My wife and I weigh about the same as always and have two 80 pound chows...
I run the fifth wheel tires at 110 psi... we tow at 62 and life is just fine
Cheers