If you're an RVer who likes to explore the National Park System, you'll want to download the free National Parks RVing Guide app.

Last year we debuted this guide as an eBook and in PDF version. Now we've repackaged it as an app that not only lets you research National Park System campgrounds that can handle RVs — fifth-wheels, trailers, and pickup campers — but which includes links to campsite reservation pages, park pages, and locator maps.

In short, it's a directory packed with RVing specific details on more than 250 campgrounds in more than 70 parks. You can search by park name, by state, or by region of the country, and we point out campgrounds that can handle big rigs — we provide maximum length numbers — those that are cellphone friendly, those with showers and dump stations, and those with ADA sites. We list nightly fees, the nearest town with fuel, even elevations.

You'll also find stories about RVing in the parks, some tips if you've just recently turned into an RVer, and some planning suggestions.

Here's what Becky Lomax, author of USA National Parks, the Complete Guide To All 63 Parks (Moon), had to say after testing the app:

"The RV App by National Parks Traveler provides a great place to start planning an RV trip to the national parks. It cuts right to the details that RVers need to know to plan their trips, thus eliminating all the irrelevant campgrounds. Links to reservations and NPS sites provide a deeper dive into the info," said Lomax.

A bonus that wasn't in the eBook or PDF are feeds of Traveler content: You'll find our latest stories as well as our most recent podcasts just a click away.

Currently the app can be found in the Google Play Store. (We're still navigating the Apple process, but hope to have that version available soon!)

For now the app is free to download because we want to get it into your hands so you can tell us what's good about it, what's not so good, and what should be added.

P.S. -- The guide's formal name is The Essential RVing Guide To The National Parks, but that's too long for the app stores, so we shortened it to National Parks RVing Guide.