I dont know if prices/rebates will be better as the year goes on, but interest rates I believe will have one more cut this year so something to think about.
BUT I see most manufacturers are offering either 0% or some other fairly low rate so IMO if your buddy finds a truck he likes and the deal seems "pretty good" then I wouldnt wait personally... I've bought vehicles all throughout the last few years though and "generally" come out pretty good. I've never paid any of the stupid mark ups and found a few pretty good deals out there on both price and APR.
There are no shortage of dealerships either especially if you live in or close to a large city. I see you live in Yuma, you might not have the plethora of dealerships we have in DFW. Dont be afraid to travel for a vehicle either if your buddy doesnt have a trade in. There are a few well known dealerships for every brand out there across the country that sell at cut rate pricing. Search the forums.