For Continental 19.5" tires, there are basically only 2 tread patterns: HDR for rear wheels and HSR for steering. I have used both on front and rear with no discernible difference in traction. Looking at them, there isn't much difference in tread patterns, either. They seem to 'sing' on some concrete surfaces enough to be bothersome, but I have gotten about 75k out of 2 sets. Tried a set of Hankooks--they wore very well, but lost all the siping/tread cuts early on and basically I was riding on hiway ribs and not very good traction.
If you find any other, I believe they would be for delivery trucks and not very useful for 450/towing. Michelin, Bridgestone, Goodyear, Continental, Sailun, Hankook and others are out there, but hard to find at a dealer.
'16 40QBH Phaeton
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten