Dalby has some nice straight long flat roads leading out to some of the smaller, more western towns...
I lived there for a few months (was sent out for work) - had to service the hospitals in Dalby, Chinchilla, Miles, Taroom, Tara, Jandowae while based in Dalby with regular trips to Roma, Warwick and Charleville districts. Driving from one place to another is incredibly boring, so get cruise control if you don't want to get booked. After a while you'll probably notice that a 2 hour trip is nothing, and a drive from Toowoomba to Ipswich is actually pretty good (and feels like about 10 minutes) because there's more than dirt and wheat to look at.
Although it is a growing town, don't be surprised if you're bored out of your brain as there's not much to do. It's been a couple of years since I've been there, but at the time the centre of town was OK with at least one nice cafe, and there were a number of pubs that have cheap counter meals with HUGE steaks! The Bunya Mountains are fairly close by too so a drive up there might be on the cards.
Damn fine advice... a PS2 was the only thing that stopped me from going completely insane... and I wasn't there for that long!