No offence intended at all, but IMO you are exactly the type of person we need to encourage into lighter less dangerous vehicles. I'm not talking about damage to roads, but damage to anything they come into contact with during an accident. Not just the weight either but the higher bumpers that miss things like side intrusion bars in a normal car.
Physics is physics and you can't argue with Newtons third law. The greater the mass, the greater the force required to move it and therefore the greater the force required to stop it.
There are plenty of other options for the points you raise. There are numerous 7 seater station wagons if extra space is needed.
As for Mt Hutt, I've done about 40 days so far this season, and have done over that for at least the last 4 seasons. All in Subarus, Either GTBs or WRXs. I agree the WRX seats need to go down to fit boards, but I can fit three boards, a pair of skis, all the boots and gear and 4 adults in my GTB with the seats up. And no less room than my mates LandCruiser. (But a lot smoother and much easier to drive up the hill)
I've never hit a rock and never had a break down, but I've seen dozens of over heated SUV's and many that have had a blow out hitting a rock between the treads.
Fact is I don't think you need to worry for a long time yet, as at this point my opinion is the minority. But I think as time goes on and petrol and carbon emissions become more expensive large SUV/4wd type vehicles will become a thing of the past, at least in the cities.