If you're real close to the highway and not looking to
spend much, this is what I would do;
Either a used Cobra 142GTL radio. You can get them, fairly, cheap on eBay
They're a nice radio and don't need a separate power supply.
OR
A used Realistic Navaho TRC-490 TRC-431
These also can be found cheap on eBay. I had the TRC-30A (23 channel) and loved it
I got the TRC-490 after that and loved it so much that I still have it somewhere.
These are not power house, nor highly sought after radios. I only suggest them
based on cost and having built-in power supplies. I know there were more with
built-in supplies but I can't think of them off the top of my head.
Also, all that is based on wanting to keep your budget LOW!
If you have money to spend, HANDS DOWN Cobra 2000 GTL
(one of the most highly sought after CB's still)