For more tire information, check out the venture riders org, tech library on tires. A lot of those folks are using Avon tires with very good results. The Avon tires have a higher load carrying rating than the Dunlop tires. I ride and live in Mexico, roads are a lot rougher here than in the states. The roads are so bad I only ride during daylight hours. I am running Avon tires on my 99 rsv. Have not had them on the bike long enough to make any statements on wear, but ride and control are very good.
On my gen 1 Venture royal I ran Metzler front and rear but did not get very good mileage out the front tire.
Hope this will give you more information and a different perspective to help you choose.