When I went to 19.5's in 2008 Rickson had a 6week wait for production. I called Les Schwab. They had Vision rims within two days. I'm running 245's on my 2006 Dodge. Zero rub or interference issues, however, completely different vehicle than yours. Some Les Schwabs will say they are not a commercial certified store. Which is baloney. The 19.5's are balanced on the exact same machine. I bought mine from the 4th Ave location in Seattle near 4th & Michigan st.
Also check Craigslist. I searched there first. Bought mine new. The next day used 19.5's became available. Some Dodge and Chevy components are shared or were. Not sure if Dodge 19.5's can bolt on to Chevy. The inner hub hole used to be different. Also, one is hub centric while the other is lug centric. Again, do your homework when purchasing used.
It's been my experience 19.5's are designed to haul heavy weight at all times. Do not expect the same empty ride as whatever your truck came with from the factory. My 245's are "G" rated. It is also possible to get "H" rated in the same size. I'm currently running Toyo M608Z. However, they are at end of life. Will be buying new tires shortly. I'll get something with a better highway tread. I also tow a Jeep. Mud Terrains on my tow rig is not really necessary.
Our Arctic Fox 811 is great in high temps or cold temps. If they still have an analog gauge for the propane heater swap it out for a $25 Walmart/Home Depot unit.