Hi Folks - have just joined with my 1985 petrol autosleeper. Hope the following is helpful.
Spent 3 weeks in May across Europe. Euro tunnel (quick and easy) straight through to Belgium to avoid Fench motorway tolls, then across Germany (no tolls) to Prague and southern Czech republic. On to Vienna - no trouble with GPS to this point. However next stop Bratislava - we tried to avoid motorways as a vignette needed on them. GPS useless, lots of new motorways courtesy of EU money, after going round in circles bought vignette - very cheap at fuel station, saw lots of vehicles stopped and fined for not having one

Bratislava big disappointment, stayed 2 hours! Camp site utilitarian. Strange to see a Tescos department store there. Drove to Tatra mountains but spent time there on the Polish side as petrol cheaper. Zakopane, Krakow and Auschwitx/Birkenau, then back into Czech to spend couple of days in the wonderfull limestone rocks area Teplice. Back into Poland, Germany, Belgium, France and tunnel home. Loved everywhere except Bratislava.
Take tow rope, triangle, 2 x yellow vests, first aid kit, spare bulbs, adaptor for 2 pin campsite hook ups (we didn't, lent twice at campsites, then had to use candles) as we didn't need them last year when we went to Italy.
Have lots of info on sites, routes, prices, etc.