That rating is baffling. My 06 QQ 1500 4x4 with 3.92 Hemi is 8350lb towing capacity. 5250 makes no sense. I have a 29ft travel trailer with a 14ft slide out that is 6300 empty. Figure another 600lbs for water and propane and I am at nearly 7000lbs without my camping gear and stuff. My truck hauls it just fine, not going to win any races and I may be able to pass a gas station but it hauls it fine.
If your new to hauling big trailers, here is a great video on the best way to setup a weight distribution hitch. I have had 7+ trailers and have used WDH on all of them but never set them up(as tight as this guys shows) like this video and I have to say, they work better if you get them this tight.