In case and I say in case you do not make the change I am getting pretty good service from Samson tires which I got from Chicago Tire via EBAY.
http://www.ebay.com/itm/6-tires-8r19-5-GL283A-All-Position-12-PR-truck-RV-tire-8x19-5-8-19-5-8195-/131226396578?pt=Motors_Car_Truck_Tires&hash=item1e8db3e7a2&vxp=mtr Make an offer at $1000.00 for all six delivered. The ones I got have all been fairly recent manufacture date.
@
@
The actual change has been discussed to death already and you can pick through the threads at
http://forums.motorhomemagazine.com/index.cfm/fuseaction/search/parms/sw%7B8r%7D|km%7Bexact%7D|kl%7Bm%7D|fm%7B%7D|pd%7B365%7D|ma%7B%7D/sr/1.cfm
Whichever you go with find a place that actually balances the tire not throw in those darn packets