Yes that will raise your trailer. We had a 285rlx2 Durango and I had 6" clearance. There were a few times where the trailer was right on the bedrails but never any damage. Good luck with the correct setup.
2004 Ford F250 Super Duty 6.0 Diesel, Bilstein 4600 Shocks, 16K B&W Patriot, Michelin M&S
2014 Augusta Flex AF34RS Trailair Tri Glide pinbox,
JT Strong Arms , Bridgestone R250'S, KYB Monotube Gas shocks
Finally a smooth ride !!!