Remember that dryline storms don't necessarily occur exclusively in west Texas or western Kansas. As I'm sure many of us remember, we had a very active dryline relatively far east during the "10 days of May" 2003, where the dryline made it to I35 on several big outbreak days. Of course, you'll have more 'dryline convection' days out west, but don't forget areas farther east.
It's tough to know what to expect road-wise. For example, I had always thought roads in northwestern OK were awesome... In fact, all of them I'd been on were good... before Oct 15th 2005... The roads north of Woodward are bad, and nearly impassable if they're wet. Likewise, I can't stand some of the areas of south-central Oklahoma (between I35 and Duncan), where options are more limited and there are plenty of trees and hills.
On the other hand, some of the 'notorious' areas that I've heard about I don't really think are that bad. For example, there are awesome chase areas in eastern Oklahoma. In addition, I found northeastern TX between I35 and Paris to be generally good, quite different than the horror stories of chasing in the sticks and forests. Sames goes for the far southwestern part of MO. I've chased the area south and west of Springfield several tiems, and I've found it to be generally good. The point? Don't not chase just because you've heard horror stories about the road network in a particular area. Of course, road networks don't matter if you get lucky and catch a classic supercell paralleling a nice road. You just never know what to expect...
Back to the western plains... There are plenty of voids in the road network in various places, but again, not much anyone can do about it. 8)