Rod,
I am not sure there is a “best” answer for these three questions.
1.
Roadside assistance – like many others we use Coach Net and have had good service on the occasions when we have had to use it. Take a look at their web site for a list of services and 00spend a little time in the FAQ section
http://www.coach-net.com/ . We went with Coach Net when we were shopping around for RV insurance.
2.
Camping Site Discount clubs to join- this also depends on your individual circumstances. For example a lot of full timers use Thousand Trails programs. However, it just didn’t make sense for us. We are members of Passport America (50% discounts), Escapee’s (15% discounts and they will get you off the road), Good Sam/Camping World (10% discounts), FMCA (10% discounts), Elks, Moose, and National Parks Senior Pass.
Many campgrounds are participants in a number of programs However, most will only give you one discount so always ask for the biggest discount first.
3.
Route Planning – this depends on what is most important to you.
a. If you want or need internet independence then Street Atlas USA is a good once you beef it up with some additional POI files from places like from poi-factory.com, poidirectory.com, Fleetwood Discovery Owners group, and/or ultimatecampgrounds.com ($6.95 annual) There is a caution: POI files from poi- factory, poi directory & discovery owners group may not have been updated in a very long time. The only reason I would not recommend Microsoft Streets and Trips is that Microsoft has sunset the program and is ending support on July 14th 2015
b. If you are looking for a cheap web based solution the Good Sam Trip planner is a good choice.
c. If you have internet connectivity and want to lay out a complex trip that you are going to download into your GPS in the shortest time then RV Trip Wizard is the best choice.
d. When we are rolling down the road and need to find something nearby we use Smartphone/ Tablet App’s and the two we use the most are Allstays Camp & RV for commercial sites, and Ultimate CG for places like state, county, regional, non-profit, Indian reservation and utility company sites.
Just as lagniappe there is one web site we try to use after the basic trip is laid out and that's
www.roadtrippers.com just because its about the trip, not the destination.
Depending on the situation we use all of these route planning tools