If part of your decision is that you want a 5th wheel for the layout than go for it. If you are looking solely at saving money, others have said it. You will loose far more on the first year of your new rigs. Maybe those that are telling you that you will loose money after 10 years is because the trade in value has a tipping point, which may be 10 years at which it might take a larger drop than at 9 or 11 years but it is still much less than depreciation on new. If you are going to trade in in the next couple of years, that is a consideration or you can drive the wheels off of it.