We both work fulltime. We share the cooking and clearing up. I do the main food shop and he does butcher and top up shops. We alternate drop off and pickup from minders. We alternate taking them to activities.
He does all admin and garage etc related to both cars. He does outdoor, garden, painting, diy (planning, buying and doing the jobs). I help with painting sometimes. He pays bills, tv, rubbish collection, internet and shops for a good price. He may plan a daytrip locally to see an open farm.
I do all dc related clothes and schoolbook buying, haircuts etc. I do most cleaning, deep cleaning, decluttering, baking. I do most dcs appointments. He will take them if I can't get time off work. I do health insurance annually. I plan and book hols, usually annual trip abroad.
Even though I do nearly all dc mental load, I don't have the mental load of service providers, bill paying, cars etc. If he did more and if I had to think of it and instruct him, it would be very difficult.
We each do our own investment planning, diff attitudes to risk.
For anyone struggling under mental load, you should give dh a complete job eg. insuring cars and shopping for good quotes, or organising utility providers and paying the bills for these.