We had a modern 18-wheeler with top flight radials sit on blacktop in New Mexico
for a week in the summer heat. Didn't smooth out until almost Los Angeles.
As mentioned, start by jacking up and spinning the wheels by hand. If that doesn't
reveal an obvious problem, you might want to take it to a truck shop and get that
front end inspected by a pro. There is too much at stake to gamble on this.
The front end components don't need to be "like new". Most of us drive around with
200.000 mile front ends that are still perfectly fine. But if the tires aren't
"egg shaped", I would want to search for anything else dramatically wrong,
just to be safe.
Oh -- welcome aboard!