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Neither of those tire sizes are significantly taller than what you have now, but with the 4.7 and 3.55 you probably lug quite a bit now. The 285/70/17s are about 2 inches taller than what you have now and will be like changing you 3.55s to 3.33s.

I have the 265/70/17s, which are about identical in size to the 285/65/17, and 3.55s and mine doesn't downshift on most hills with the cruise on, but I have the 5.7.

Here is a link to an Excel calculator you can use to help determine several factors for changing tires/gears.

http://bh2.htc.net/~greenlee/Calculator and Converters3.xls
 
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