Don't think the OP understands how the puck system works. Yes you would need an adapter using the FW prep.
A new truck, I'd just do it right. Sell your current hitch on market place etc. Now get a quality hitch to drop direct into the pucks, with no need to buy a heavy/expensive adapter. You should not even need a sliding hitch. An adjustable ahead/back quality hitch, such as the B&W 3300 will give good clearance, when towing a newer rounded front FW, that is designed for a standard bed truck.
Using adapters can add several more inches of height to your hitch, which may mean towing some FWs more nose high.
Jerry
