To both Gene and Gary, We have been RVing for many decades. Some years we put in more miles than others. We are getting some years on us and admit I am not as up to speed on the latest technology as many others posting here. I have been using the Good Sam Trip planner for many years and have had good success using it. If you get right down to it, it's a paid subscription too, Good Sam membership is required. Per Gary's suggestion, I'm going to have a look at RV trip master.
As far as apps go, besides the Trip planning apps, If you are towing with a later truck, lots of stuff out there thats blue tooth compatible. I am setting up a TireMinder, Smart tire pressure monitoring system in the coming days. Monitoring tire pressure is essential. A RV trailer tire coming apart can cause all sorts of damage. Always been a believer in "an ounce of prevention is worth a pound of cure". However, the system doesn't to much for a total, catastrophic blowout. That can happen so fast that by the time the system lets you know, the damage may already have occurred. Just food for thought.
All sorts of great ideas on this message board.