I agree IF you find the right truck , or are able to do your own repairs. I know I would not buy a vehicle to drive cross country without having it gone over ( like you , I do my own auto repairs ). Buying a trailer is pretty easy , not a whole lot to go wrong , but a tow rig , whole diff story. Especially if driving it a couple thousand miles.
For one way non local moves , uhaul doesnt charge mileage . Indeed it is not cheap . Never priced a POD or UPACK. Might be a viable option.