Hi Flanders and
to the Forum from PD and the girls
Yes, weight is a major factor and the prime cause for people selling their dolls soon after acquiring them.
You learn the techniques for moving them that work best for you and there is a lot of advice on here.
My lightest girl, Miranda Louise, is 35Kg and my heaviest, Morgana (XY170) is around 48Kg! Most of mine are over 40Kg and I have learnt the ways of moving them that work best for me.
In time, you will find that it gets easier