I tow my son up at the smaller bike parks / DH tracks, e.g Forest of Dean, Flyup 417, Cannock Chase.
He prefers to ride his DH bike at these (Marin Quake), but he also an eMTB (Trek Rail) for 'easier' rides outs
We did Forest of Dean on Monday and going back on Thursday again.
I tow him up the short fire road climb for the DH tracks - two batteries is enough for 5+ hours.
For uplift parks - e.g. BPW, We still both use uplifts currently, going to Revolution this Saturday and DYFI the following Sat
When he's old enough I will pay for a uplift for him and I will EMTB ride up to the top.
We had FoD to ourselves on Monday evening - The bottom of GBU