3/4 ton truck questions

I don't know about the VIN number check but my RAM 3500 didn't have a factory 5th wheel prep package. I just had the dealer where I bought my 5th wheel put one in. It consists of two rails that the hitch pins to with 4 pins. Easy to put in and take out. I have the B&W Patriot 16K hitch that was recommended to me in these forums by MFL. I couldn't be happier. I had a 35 foot travel trailer before and now have a 34 foot 5th wheel. I am so happy with the decisions I made. Take the advice of other long standing members here when they reply to you and you too will be happy. This place has so many members with a wealth of information!