You list its an FX2, if memory serves you have 411 already. You biggest issue will be long up hill draws and you will have some. I assume from Nevada you'll take I80 all the way, you may want to check out I-70. I think you will have less high country pulls. Basicly you just have to cross the rockies in Colorado, and it is a fairly flat thru Utah south out of Salt Lake and for most of I-70 until the state line. Once over loveland its all down hill and east for Denver starts the rolling hills out to Topeka, KS.
Back to your truck, If you have a cap on the bed it will make pulling even easier, as the front of the trailer will not act as big wall. Keep the revs up and shut of the OD. When you see a draw comming up accelerate try to maintain speed up the hill without the trans shifting, ie hit the base pulling 3200 to 3500 kicked down in 2nd or 3rd and maintain throttle pressure and a little more pressure as you climb. You will get the feel of it, but let that engine run she'll need to be up in the mid 3k on the tach to make the any descent climb with out slamming the next lower gear.
PS; with a cap on the bed, you can grab some comfortable shut eye at any rest stop.