[Big Dave]

Its not the size per se, but the combination of size and acceleration people like. As pointed out Corvettes and Porsches (relatively small but very fast cars) sold briskly. Still do even with high gas prices. Big slow H2s sold briskly. Not now but if an oil bubble bursts, they'll be back.

But combine low, light, and slow and people get paranoid. You cannot reason with that perception. You may as well bark at the moon.

BTW, big vehicle have fabulous brakes these days. At least mine dones.

People have also come to dislike a semi-reclined seating position and many don't care to do yoga to get in and out of them. This dictates a rather tall vehicle.

All this is whyI think it is more constructive to improve the vehicles people like than building something you have to eschew air conditioning and you back for.