Hello everyone!

My husband and I are moving from Seattle, WA to Nashville, TN in early June. We will be driving a 16' Penske truck and pulling our car on a car carrier.

We know that generally there are 2 main routes to take. We have been referring to them as the "Northern Route" and the "Southern Route".
-The Northern Route is I90 (We'd travel through states WA, ID, MT, SD, IA, MO, IL, KT, TN)
-The Southern Route is I84/I80 (We'd travel through states WA, OR, ID, UT, WY, NE, MO, IL, KT, TN)

When comparing the two routes:
-Distance - both routes are roughly the same distance of about 2500 miles.
-Elevation - I've read that I90 has a lower elevation (max elevation around 6,000 ft) and that I84/I80 has more wind because it's generally more flat and at a higher elevation (max elevation around 8600 ft).
-Scenery - I've read that the scenery traveling through ID and MT is stunning and that I90 is a much prettier route that I80/I84.

With all of that said, here are my main 2 questions:
1) Which route do you recommend, the Northern or Southern Route? Do you agree with my above comparison of the 2 routes? Also, because we are traveling in early June (as opposed to winter), does it not really matter so much which route we take? If it's most likely going to be summer weather (temps in the 70's and 80's), and both routes are about the same distance, then we might as well choose the route that is more scenic and at a lower elevation (the Northern Route), right? Will we be okay driving a 16' truck pulling a car carrier taking I90? (Sorry, I guess my first question ended up turning into 5 questions).

2) We are thinking that because it will be June (peak season), that we should reserve our hotels rooms for each night ahead of time (like start booking the rooms now which is currently 6 weeks prior to our move). If we were moving in the wintertime, I think we could probably get away with just winging the hotel rooms every night on the spot as I'm sure rooms would have more availability in the wintertime. However, because it will be the first week of June which is busy peak season, I just feel like I would hate to get stuck and have us stressed out because we can't find an available room after an exhausting day of driving. I just feel like it will be less stressful for us to know we have a guaranteed place to lay our heads at the end of each long day of traveling. What are your thoughts and opinions about booking the rooms ahead of time instead of winging it day-of on the spot?

I'd really appreciate any thoughts or feedback anyone can give me. Thank you in advance!! :)

~Becca~