Moving from a 2004 F250 6.0 with FX4 package to a 2012 F350 6.7 with FX4 package. The old truck had 285/65r/16's and the new truck has the stock 275/70r/18's. I know this truck is a little taller. I used a 1" standard drop on the ball mount on the other truck and it looks to me like thats to high for the trailer now. I'm towing a 21' Bass boat. I measured the trailer with the tongue level, it was 16" to the bottom of the ball cup. The truck at the receiver measured 21" to the bottom of the receiver hole. I'm not sure what kind of drop I should get to match these up. Any suggestions?