Interesting new adventure!  I didn't think the traffic was quite that heavy on I-80 last time we went through there.  Didn't see more than 4 or 5 rvs in the two days on interstate(must be taking a different road?)  Those trucks made me feel pretty small when tucked in between with our Colorado.  DP handled well but was a little "tight" going through Salt Lake City at 7 at night.  Decided we have to travel daytime hours as our night vision isn't as good as it used to be.  Seeing lot more rvs on I-15 and traffic flows nicely(must be getting used to it)  Picked up a copy of RVers Friend and it was a life saver for finding night time stops.  The truck drivers were helpful too and good about sharing space with us.  Current goal is to get south of all the weather and lean back in the sunshine.  Talk about learning something new every day!
I do have one question though.  How do you find your travel routes?  Do you just take the roads on your maps and gps?  The reason I ask is because our TomTom told us to use a road around Salt Lake and when we got up to the exit there was a warning about large vehicles(didn't take it) 

With a large rig you are best off, we think, sticking to state and US highways, all of them are suitable for trucks. The lanes are the same width going through Salt Lake City as they are in the country. Just pick a middle lane and stay there. Over time, you will get more comfortable with traffic.

Fred makes a good point.I would also get the Motor Carriers Trucker Atlas and while you are at it get a Mountain directory.All very helpful. Most average GPS's don't have any idea you are driving an oversized vehicle.Some brands are now making trucker models that take that into consideration but they are quite pricey right now.We have overruled our GPS a few times in our 7 months so far.

I start off with Good Sam Travel Tools, it has an option to put in Large RV.  This is my base route a comparison to the Mountain Guides, just so we don't have any surprises.  So far it has worked out okay. 

Jo

Thanks soo much. I knew I would get good advice here. I also plan on getting a rv camp book(Woodalls?) as I am relying on wifi so far and was only able to find 3 on gps.

A good source for campgrounds:http://www.rvparkreviews.com/

Maybe there's a GPS device that is good for RVs and trucks, but we only used ours when we were travelling without the 5th wheel in tow. Good thing too, as we got ourselves into some tight spots near Carmel, CA with our long bed 22' crew cab truck! Good tool for locating nearby grocers and/or attractions - stinky for travelling with any size rig! Definitely listen to the sage advice offered above! Blessings, Linda

Always use RV Parks reviews when I can get online but still think a "paper" book with campgrounds would help too. Advice from here always FIRST Linda, Thanks

We are partial to Trailer Life Directory.  But then again, we are Good Sam members so get the 50% discount price.  From what I have seen, Woodhull's and Trailer Life are about the same and have pretty much the same parks listed.