Hi Dawn,
We've spent a few nights near the snowline in our campervan with no problems. You'll be fine - just don't buy cheap quilts or sleeping bags from The Warehouse. They'll go 'bobbly' after a few nights and fall apart when you was them.
Apart from the weather, a lot will depend on the van you hire. As a rule of thumb, if it's made in Australia, it won't have any insulation as there's not much call for it over there. NZ built vans are a bit better, but tend to have HUGE windows so you can enjoy the fabulous views. Most campervan windows are single glazed, so they steam up while you're asleep. If you hire a European van, it will probably be insulated and have double-glazed plastic windows as standard. Much better in the cold.
We've got a German van, which is well insulated. It's got gas-fired heating and electric underfloor mats, so it's very toasty. We get a bit of condensation on the cab window, but none in the back. We cut down the condensation by putting a thermal blanket over the windscreen. Ask your campervan people - they might have one you can borrow.
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