Have a "newbie" question. Just purchased a 2013 Ram 1500 4wd and wanted to make sure I used the 4wd correctly when needed. What are the issues if in certain instances I needed to put my truck in reverse while in 4wd? It shouldn't happen very often but is it ok to do so when needed? Or should I change back to 2wd drive then back to 4wd? Thanks.