We made a similar trip a few years ago in a 23 foot C, no toad, no trouble. About two weeks on the road. We also added Monument Valley and we took the North Rim of the Grand Canyon instead of the South Rim. We had been to the South on previous trips and found the North very enjoyable and, to our tastes, preferable. Our trip was in May and it got down to below freezing a couple of times in Bryce that year on this trip.
Some great ideas have posted on this thread. Since your rig is almost new (2016) you shouldn't have any problems. Utah is one of our favorite states to visit and we go there often.