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I think its a bit much to expect a 7year old and an 8 year old to tow the caravan all that way but if you must

http://users.telenet.be/leo.huybrechts/00frame.htm

I find this site very useful for finding stopovers if you are using motorways.

Don't know about Tesco vouchers though.

If by 'motorway stopovers' you mean the service stations, or Aires, then they are free to stay overnight BUT I personally wouldn't stay on any down the Rhone Valley.  We do stay on some service areas, but only those that we know and have visited during the day to assess how suitable and how safe they are - and only ever on our first night when we can't get into a suitable campsite because of the timing of our ferry. 

For a first time holiday in France I would advise a campsite.  There are sites in most of the large towns near the autoroutes, and some (such as the site in Macon or Tournus) are really near to the motorway exits.  Some are very cheap - but all are set up for overnight stops so you don't need to book at most - but you will need to arrive mid to late afternoon, which may not suit your planned journey timings.  Fees are likely to be between 15 and 25 euros per night because on most French sites you pay extra for children.

If you do decide on a motorway service area then there may be people on here who have stayed on some on your planned route who can help.