You might check with Schneider.They have a 2weekon,1week off program.You have to leave your truck at the terminal on your week off.I believe they have some part driver positions.That is the only company I know off that has what you might be looking for.
With any of these companies, I'm sure you have to have some proven experience to be a slip seat driver.
info off the Roehl site;
Roehl 7-on/7-off Fleet The ultimate home time, exclusively from Roehl. Drive 7, be home 7. 7-on / 7-off Drivers are paid at the National Fleet rate (in 2004 7/7 drivers averaged 85,000 miles - $34,000). Please check with a Roehl recruiter to see if we're currently hiring 7/7 drivers in your area. Space in the 7-on / 7-off fleet program may be limited in some areas of the country. *Must have minimum of 50,000 miles experience
Roehl and Schneider both offer 7 on /7 off,slip seat and leave truck at terminals,I ran with Roehl and still got over 3000 miles a week,back in 2005,don't know how it is now.
knight has an express schedule. you're on for one to three weeks or longer, and off for a week. the only downfall is that you'll be slip-seating. you may get a truck that goes 65mph, empty it out for your time off, and get into another truck that does 61 pedal, 59 cruise. i've had a LOT of those trucks. they're no fun.