The thread about Michelin dropping the Defender tires in the van sizes got me going back for another look at what options would be for "alt-sizing" the wheels and tires, to see if something might work out better that way. We have found in the past that there are very few wheels available for the Chevies that have the correct, or close enough, offset. This includes the Roadtrek installed aluminum wheels which are way off at -6mm, 0, or +8mm. Factory steel wheels are +28 offset.
Here is a link to Hubcap Haven that shows options for a 2009 Silverado that shows all the factory wheels that will fit our vans also, including the stock steel ones. A few years of pickups used the same offset.
If you stick to stock size tires of 245-75-16, you have two options with a steel wheel and one aluminum wheel.
If you want to go oversize to 265-75-16 you have only one steel wheel as an option.
Several of us have done the 265-75-16 size to get the extra load capacity of them for extra "headroom" before maxing out. You get about 300# per tire more capacity.
There is also an aluminum wheel shown in 17" size that would fit the vans and allow a 265-70-17 tire to be used. They are the same diameter as the 265-75-16 oversized tires at about 1" bigger than stock. They also have more capacity than stock, but more like 150# per tire or so.
Nice aftermarket aluminum wheels have been hard to find that have the right offset and large enough load capacity, especially at the higher ratings the upsized tires give.
I did a quick look while doing the tire discussion research, I did come across an option that is quite good in an aftermarket wheel for the 17" size tires.
+25mm offset in the 17" size, only +15mm in 16" though so probably lower than I would like. Huge load capacity at 3650# so plenty there. Also come in chrome and black. I have a set of Vision wheels on my old Buick Roadmaster and the quality looks to be very good for moderately priced wheels. You can get 17X8 wheels for the van for about $130 each including wheel center caps, so very inexpensive.
For us, when we need tires, it would be tempting, but not sure I want to give up some of our extra load capacity, when we need tires in a relatively short time. I do like the look of them.
The normal "rules" say that lower profile tires will give slightly better steering response and slightly rougher ride, which for us would be good and bad in the same order.
Now we just need someone to Photoshop them onto a Chevy B to see what they would really look like!