I drive I30 near Rockwall but don't recall much of a hill ,, unless you mean that small bump as your going east and have just gone past the Lake ?

This Lake Travic Hill in Austin was larger. But then again I don't have 4 passengers alot of the time. And one of them was a Salesman , I was hoping that his hot air would counter act his weight in the car

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Eric in Plano,Tx
85 300D 277K overall miles
65K on WVO (2 tank)
Rebuilt Transmission at 245k miles.

96 CE LT1
94 Nissian Hardbody
96 F250 XLT PowerStroke (also runs on WVO)