Make a List (or lists)
• Make a list of all the things that you can look at and think: Why did we even bother to move that the last time? Now will be your last and best chance to give or throw away unwanted items until your next move (5-7 years on average). Give unwanted clothes, furniture, kitchen items, etc. to a charity that allows you to use your donation as a tax write-off. Yard sales are another option.
• Make a list (and/or get one online) of household hazardous materials. These are common items in your home that are not or might not be safe to transport: flammables like propane tanks (even empty ones), gasoline or kerosene, aerosols or compressed gases (hair spray, spray paint), cleaning fluids in plastic containers (bleach, ammonia) and pesticides (bug spray) and herbicides (weed killer) and caustics like lye or pool acid.
There is more likely to be damage caused by leakage of cleaning fluids-- like bleach--than there is by damage caused by a violent explosion or fire in your truck. The problem lies in the fact that any leaking fluid is going to drip its way to the floor and spread out--even in the short time span of your move and more so if you are going up and down hills. Aerosols can explode in the summer heat as can propane BBQ tanks. Gasoline from lawnmowers and pesticide vapors expand in the heat and can permeate everything in the truck. Plastic containers that have been opened can expand and contract with a change in temperature and altitude and crack.