A knapsack with a 5 watt panel, gel battery and notebook computer & camera...
OR an 8-track tape player, water pump and a microwave oven in an old trailer...
OR a hand-truck with the 12V AGM, PV panel and inverter...
does not compare with converting a pickup to deep-cell battery motive power, putting a lister diesel in an Quad ATV or making a wood gas conversion Hupmobile.