David & Ann
Get yourself a freeway (Motorway) sticker for around 9 Euro at the border crossing. It is a toll for driving the major roads. Valid for the year and you can drive to hell and back. Get caught without one, you gotta dig deep. If you keep to country roads you don't need it, but better safe than sorry. Freeway gas stations have showers, cost 1 Euro for a shower, !0 Euro deposit for the key, you get it back when you return the key, not the 1 Euro. Truckers use this facility a lot. Go to Prague, it's worth the visit. Wildcamp anywhere of a side street where there is no traffic.
Have fun.David