Only you know how you tolerate heat and whether you will sweat out salt, etc., fast. I never have gone to Utah's desert parks in the summer because it is a furnace.
Vail Pass (I-70) is over 11,000'. If you want to avoid high passes, you will have to go through New Mexico or Wyoming. I don't know the capacity of your truck's engine or the weight of your trailer. Some people have an easy time on Colorado passes with a half ton, some don't. With 385 hp my 1/2 ton Tundra gives me no problems.
Utah is for the spring or fall, you'll enjoy it more then.
Gene
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