Construction on I-35 from Waco south to Georgetown. Expect heavy traffic going thru downtown Austin. Rush hours are a bear. Other times are bearable, but slow. Bear to the right to take the elevated part across downtown for a better view while you're sitting there.
Where'd all those bears come from?
McKinney Falls SP for a nice campsite close to Austin to drop the trailer and explore the capital.
Buckee's for cheap gas, expensive food, clean restrooms. Temple's has about a hunnert gas pumps.
Wave as you go thru Round Rock.