Heh... well, can't do much better than information from someone who lives right at the intersection of the 2 routes I'm considering!
Thanks for the feedback... I figured the US62-US59 route would take somewhat longer, but I didn't imagine it might add more than an hour. I may just plan out both routes and if we're magically ready to leave before traffic-time on Thursday morning we'll take the scenic route, otherwise we'll wait out the DFW traffic and just trundle along US69 to the turnpike. For us furr'ners who don't have an OK toll pass it's an extra dollar, their site says it'll be $5.25 with a 2-axle trailer. Discrimination!
Another possibility is to take the scenic route back home on Sunday, but that may also depend on departure time. It's already going to be a long pull and I'll want to unload and store the trailer Sunday night, though I can park it in front of the house for a day (in fact I'll be doing that Wednesday on our way out.)