Hello and welcome to 2CarPros. Personally, I would bet that your tires are simply out of balance. It could be that a balancing weight has fallen off, or maybe you went through some sticky cruddy mud and got a little bit stuck between the rim and the tire. Either way, a balancing should take care of it. Any tire shop can balance them for you for less than $20.00.
If that's not it, then my only other though would be a warped brake rotor due to the brakes being overheated at some point. You can drive the truck around for about ten minutes and then get out and check the wheel temperatures. If one is hotter than the others, then there's an issue there (sticky caliper, pad swelling too much and sticking, or a collapsing brake line). Further diagnosis is needed in order to figure out what the problem is.
Check out this guide that we've prepared on this exact subject:
https://www.2carpros.com/articles/steering-wheel-shakes-when-accelerating-or-braking
Good luck. Let me know what you find and we'll go from there.
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Sunday, March 17th, 2019 AT 11:39 AM