You should do OK except for what mowingman said. However, when you get near to the DFW area, it is a total crapshoot--heavy construction/delays going on the I-35W branchoff, and I think I-35E is nearly as bad.
On I-35W, from Alliance Airport to center of Fort Worth is or can be a horrible delay, and bumpy temp lanes. Can't help more on the I-35E side, but you have to remember, there are tons of people and vehicles in this area, just about every roadway is swamped with traffic.
If Dallas is your destination, wish you luck. If going further south, might consider going over to US 281--out of direct line, but can be quicker most of the time. OKC>I-44 to Wichita Falls>US 281 to San Antonio. I would do it in a heartbeat, will not tow on I-35 south of Waco, much construction. Austin is a nightmare, unless you take the toll bypass, but very expensive towing.
'05 36TK3 Mobile Suites
'10 F450 new to me
'09 F450 Lariat 4x4--died