This question reads as though you are considering giving the microwave a more comfortable ride than the harp.

The back of the truck will not be cooled and the heat will damage your harp. It should be in the same climate as yourself. Any possibility of renting a van instead so the harp and everything else can be in the cabin with you and your family?

Hi, Shelby: Catherine’s right about the temperature. While your mom is correct that harps are shipped all over the country in cardboard boxes in trucks, they also aren’t shipped if the temperature is outside a certain range. Living in Florida, I’ve had to wait for it to be cool enough in the southern half of the country to get a new harp shipped from up north. I’ve also had to wait for it to be warm enough for a harp to be shipped from Chicago. Harps can be packaged and cushioned well enough, but that doesn’t mean it won’t get hot enough to damage the finish or weaken the glue. If you wouldn’t endure the temp, your harp shouldn’t.

The shocks on the bed of a truck are not good! See my respose further down in this thread.