Questions of driving US-2 through the west

I do have a brake controller for the trailer.

So it sounds like the elevation changes shouldn't cause many problems if I just follow the advise everyone gave.

Sound planning may be a bonus to help keeping the tank above half. I assume campsites should be reserved to assure not getting stuck without one. We don't need lots of amenities, just water, electric and dump sites.

Thanks to all for the input.

If you come West you're going to have to drive some 'hills'... even interstates will have them. I also suggest purchasing online the 'Mountain Directory for Truckers & RVers'. It will give you a heads up on popular roads in the West. It comes in a eastern version, also. Many you can drive with a RV; some not advised. You'll soon get a feel of what you can handle.

Downshift before you even start down a grade; not in the midst of the downhill. You'll barely have to touch the brakes if you're shifting correctly.

Hwy 2 is a super easy drive. We enjoy it. As recommended, drive on the top 1/2 of your tank. Montana is 'Big Sky Country' and the expanses go on forever, it seems.

In Montana at the south edge of Glacier Nat'l Park is Marias Pass at 5280 elevation. Around Browning you'll have about "3-4 miles of descent that varies from 3 to 6%. It is a good two lane road." (taken from the Mountain Directory). In Idaho on Hwy 2 are no issues. In Washington you'll have Stevens Pass at 4061' elevation. Taken from the Mountain Directory"The westbound descent is 6 1/2 miles of 5-6% with 40 mph curves. The first 4 1/2 miles down from the summit are four lane. It then turns to three lane and then two lane." You'll have the same grades on some interstates. You'll be a pro in no time! :)

Do you have a brake controller for the trailer?

The only pass/ mountain to cross is Marias Pass Browning Mt to West Glacier, very easy route to Bonner's Ferry ID.
But take 2/95 south to 90 then 90 west thru Spokane then 2 again. staying with 2 all the way takes you thru the city of Spokane's stop and go traffic.

Get a copy of Mountain Directory West. By my reading there is only one pass in Montana that has a 6% grade downhill going west. If you use the trucks engine braking 6% is a piece of cake.
We drove Route 2 some years back. Don't let your gas gauge drop below half and don't expect large campgrounds with full facilities; swimming pools, miniature golf, etc.
I'd do it again. We pull 7500 lbs.