My company is based on the north side of Dallas in Plano, so I drive in and out of DFW from various directions with my RV many times each year. For me, knowing the roads, it's not too bad, but certainly it's stressfull.
For your route from Weatherford to DeKalb, I would take 20 across the south side of the metroplex (it turns into 635), and then out 30.
Sat/Sun are of course the lighter traffic days if possible, but I've come through during rush hour as well.
Rob - Solo Full Timer
2017 Winnebago Travato 59G
Former 2006 Mandalay 40E