2007 Sightseer 29R
F53 V-10
I've towed my Heritage in a Pace 5x8 for 20K+ miles with no problem. The bike/trailer/stuff weights 1800 pounds and I don't even know it's back there. Since I've got the same engine as you, and I assume about the same MH weight (18,000 dry) I can't see an additional thousand pounds or so making much difference.
John