I recently bought a new HD tow vehicle and it has a 2.5 inch receiver. My current Reese WD set up has a 2" shank and I don't think the WD head will accept a 2.5" shank. I use a 2" adapter inside the 2.5 receiver for towing a lightweight boat but, I don't know if using an adapter with the WD system would be advisable. 6000 GVWR and 700 TW. What advice can you give me? TIA.