Help the truck seems to shimmy a little at higher speeds and I have uneven tire wear (front ) I need a prognosis and a way to test your thesis

Uneven tyre wear can only really be caused by either worn suspension or steering components, or wheel alignment angles incorrect. The best way to check this out is to get a wheel alignment carried out by a reputable specialist, as they will (or certainly should) go over your suspension and steering first to make sure there are no faults before they reset the wheel alignment. The other thing to note is that if the uneven tyre wear is bad enough the wheel alignment won't fix the wear problem, just slow it down.
The shimmy could be caused by a couple of things (driveshaft out of balance, tyre fault, wheel balance) but the best thing to do initially is get the wheels balanced first and see if that fixes the problem, and then go from there.
The same company should be able to both the alignment and balance, and these jobs should both be done periodically (at least whenever you replace tyres) to improve tyre life and make the vehicle easier and nicer to drive.

Hope this helps,
Mark.