[SCOTI]

It's not about what ''the shop'' wants/likes, it should be about what you want/like. Would you run your current 215-70-15 set-up on all 4 corners & still like the look? What 'look' do you like?

Your current set-up is ~27" tall in front & ~28" rear. I'd consider this a common big/little 'look'. It works well because IMO these trucks need a 28" minimum rear tire or they look awkward (regardless of how low they are). Being slighlty wider is also a common trick on the rears to help 'fill things up' better. So 7-8" wide front wheels & 8-10" rears fill the wheel wells up nicely.

As 'bubba353z' stated, not being able to rotate tires isn't a financial deal breaker. I've never owned a vehicle in my 28yrs of driving experience that I rotated the tires on. Every last one of them has had taller diameter rear tires. Worst case scenario was that I went through 4 fronts in the time it took to replace the rears.

I like the look of your truck as is! Gotta love the OE/slammed rides.... How much room do you have to play with now before interference up front?