This is from a post I made in the "Snowheads" ski forum a few years ago.
On the whole we chose ski lift carparks in rural areas, there are a couple of "aire de camping car" with servicepoints and a few campsites as well. The ten places we stayed were:
Bugnenets-Savagnieres: coach parking area
Charmey: aire with servicepoint and payable elec hookup, adjacent to gondola. CHF15 per day including eurorelais token.
Crans Montana: campsite €35 per day (bit of a hike to lifts or get bus)
Grimentz: aire with servicepoint and free hookup. CHF5 per day carparking plus CHF15 per day for motorhome (which judging by Swiss campers seemed to be "optional")
Les Diablerets: official motorhome parking spaces in carpark next to sports centre, no servicepoint but toilets at sports centre open all night and water available, free.
Les Mosses: unofficial motorhome parking at Arsat lift carpark halfway to La Lecherette. Several campers at weekends, no facilities but lift toilet nearby.
Leysin: aire by ice rink but servicepoint closed in winter (grey waste ok), free.
Moleson: rural lift carpark.
Ovronnaz: several carparks, we chose last on right 400m before chairlift.
Gryon (Villars): official aire with servicepoint but only 2 places, in carpark opposite tourist info CHF2.80 pppn local tax. Also a campsite right by the lift station.
Servicepoints in main valley: Villeneuve; outside campsite was working. Motorway services just north of Martigny was out of order but could dump waste. St Leonards servicepoint closed (but could overnight park). Saviese closed but could dump waste (and park). There is also a campsite near Sion that friends used a couple of times to replenish and do the laundry. You can also officially overnight at the Thermal Baths at Saillon and use facilities.
Gas. The only lpg available south of Fribourg were at the ENI station by the airport in Sion, and motorway services at Lausanne (all others shown on mylpg.eu were closed). We bought Swiss Vitogaz bottles at about CHF44 for a 10.5kg bottle. Consignment charge is CHF55 deposit but you get a deposit card and a 100% refund upon return, Vitogaz dealers widespread and in most places listed above.
There were several of the smaller areas which we didn't get to where rural ski lift carparks were also available, notably Nax.
In all we spent about £200 on parking and camping fees during 7 weeks in resorts. This trip was our least expensive 2 month trip and the most varied and enjoyable.
Saas Fee is the most notable addition since I posted that. A dedicated motorhome aire with electric hookup and a small toilet block plus services.
There are also a few campsites in the Rhone valley which are open all winter., near Sion and at Villeneuve by Lake Geneva. There are several new areas on the magic pass in the Jura which have campsites nearby but haven't been to them.
Ps. The pass started at CHF499 this year which lasted till mid summer then it starts to creep up.
Last year we drove up to Arolla which is at the end of the world! No overnight parking allowed in the main carpark but we parked down the road a bit: glad we went...
