I would agree. I am not sure that the tire companies offer a tire in that diameter with a LT rating. I am leaving the 17's on my Armada and removing the 285 70 R17 BF Goodrich Radial Long Trail T/A's and replacing them with the LT285 70 R17 BF Goodrich Radail All Terrain K/O. This has a heavier sidewall and diameter to accomodate two things:
1) the weight of the Armada itself
2) the weight of the Armada with a 5900lb trailer
I am not saying that I am a tire expert, but I have had my experience with different diameter wheels and tires. As far as I know not too many companies have the "light truck" (LT) rating on their 20" or 22" designs. I could be wrong. I am staying with this size and going to replace them with 17" chrome plated factory styles in the near future.
I was considering the Armada wheel in chrome and found one place that was charging $550 out of California. Has anyone found anyone else or a different price? These had a warranty of 1 year on the chrome.