Marty,
Congratulations on the long term engagement. You two are special. Keep it up.
As to the trip, before you leave Oregon, about Exit 302 on 84 S, up and toward your l0 o'clock is the Oregon Trail Museum. It is definately worth a stop if you haven't been there. If you enjoy history, it could take you half a day there. And remember, you are going to cover in 6 hours, what the pioneers did in 3 months.
Headed SE on 82, first town in Utah is Snowville, then after you breakout of the big hills, and see the Wasatch on your left, take the exit to Tremonton, go east across the tracks and turn south toward Honeyville. There is a very adequate hotsprings "spa" there. Crystal Springs rings a bell, but I may be wrong on that name. Great place to unwind after the long trek through the desert.
As to eats, I only did truck stop stuff when I was running down there.
Harvey
SleepyC :moon