17.5" rims are the tubeless version of your 16's. There will be no difference in the height of the overall tire/rim assembly. I used to use a 20" tube-type wheel and a 22.5" tubeless on the same hub of tractor/trailer rigs with no height difference when I was managing a truck shop, pretty regularly. If you want a taller setup, use 18" tube-types or 19.5" tubeless. They are also corresponding height. My 59 model 3800 dually used 18's before I parked it. I've got six 18" tube-type wheels with so-so tires, if you want to come get them.

Try to find a salvage yard that's parting out old bread trucks. A lot of them in the Nashville area used to use 19.5"s.
Jerry

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