Once again the Weight Police are at it again!!!
The OP can carry that 5er with ease!!! He should also be able to pull it just fine with the 6.4 Hemi. The OP's Payload si 3,148 from the yellow sticker
Specs on the 5er;
Technical Specifications:
Length 32'-11"
Dry Weight 9,560#
Payload Capacity 2,915#
GVWR 12,475#
Hitch Weight Dry 2,075#
Hitch Weight Wet 2,495# 20 percent of 12,475
3,148 - 2,495 = leaves 653# for passengers and stuff, at the trailers max GVWR. So if the OP tows at 1,200# of stuff in the 5er pin would be about 2,160# then the OP has close to 1,000# for stuff!