I have a 2004 Ford F-250. I am considering buying a Lance 815 or 845. The dealer told me I should install air bags. I am sure it will improve handling. I would like to trade pickup in the next 2-3 years. Is it imperative that I put bags on this pickup? It seems like a large investment to leave on a pickup I will trade in. I really won't use it much until I retire in 6-8 years. What do you think?