"How would one load up trash in the back of a pickup truck to take to the landfill?"

The same way I do it now, rent or buy a truck or a trailer.

"How would you take a fishing trip off road to the edge of the lake?"

You rent or buy a manual drive car. It'd be illegal to use in manual drive mode on the freeway or in the city but off road or on the track or on your own property you can use it however you want.