I'll start:

Load up a truck with several tons of batteries, charge them, and ship the electricity south.

Not really worth it.

A ballpark calculation - ignoring any infrastructure and time for charging/offloading, assuming you get the batteries and the electricity for free, using Tesla batteries as an example, a MWh of them would weigh more than 6 tons; so freight truck can carry at most 2-3 MWh worth of batteries (density is likely to be an issue) and the sale price of that truck full of electricity even at the current outrageous prices is just 1000 eur, perhaps 2000 if you drive all the way across Europe. Shipping cargo on such trucks costs something like 1.5 eur/km nowadays (we don't have cheap self-driving electric trucks yet..) so if you'd have to drive more than a few hundred km (and you have to drive the batteries back!), you'd be better off using these trucks to ship something else than electricity.

At this 6km/20 mins long ferry crossing the electric ferry containing 1MWh of batteries can charge at €10/MWh on the north side of the fjord, with the price on the south side at approximately €500/MWh... https://en.wikipedia.org/wiki/MV_Ampere

A 6km high voltage transmission line will be much more effective still.

And do what when you get there? Sell them by the roadside like fresh vegetables? A few tons of batteries' worth of electricity is hardly worth a utility company's time.