Take this from a guy with a 9-month-old who hasn't been that way in almost a full year now, but both roads are fairly rough compared to virtually any road I had previously driven on, and I grew up in rural Missouri and lived on a 7 mile long dirt road.
The road to the Con does wash-out in about 3-4 sections after a good rain, so expect to drive over standing water + large stones at times. The road to the Rap is mostly rough at the initial section and then further toward the Hoover camps. Well, the whole road is rough, but those are the sections that are most rocky and or littered with dips and holes.
If you have something like a subaru, you'll be fine. Some people will only take a truck up there, and some seem to do okay with small passenger cars. I don't care what anyone does, but in the numerous trips Beth and I made to both of those streams in the past 4-5 years, we have seen one ford taurus with its oil pan stripped out and ditched at the first parking turnout, and at least one TPFR member high-centered his mitsubishi up there back in 2010. As luck would have it, another fisherman with a ford 150 came along and pulled him off of it., and he only had cosmetic damage, surprisingly.
TB