Cummins12V98 wrote:
If you have the factory pucks great of not add them it's not hard to do and not expensive. Go with either the B&W RVK3600 in pic below and adjust the location of the kingpin to suite your 5er or the B&W slider with a picture frame adapter. I would suggest the 3600 because you will want a larger truck and you will be able to take the hitch with you.
I will refrain from comment for now on the RV size and 3" lift.

I agree on anything by B&W, puck, rail, gooseneck base, slider or not. I =will= comment on the weight and lift. You're almost certainly not going to have enough bed rail clearance with a 3" lift. You're likely going to have to either significantly raise any FW you buy or lose the 3" lift. As for weight, you're looking at +/- 3,500 lbs pin weight, when loaded to the 15,500 GVW. That's firmly in 1 ton range, IMO.
Lyle