What weight distributing hitch are you using? I've pulled my loaded XT276 in 40 mph winds without any sway problems using the Equal-I-Zer W/D hitch setup. It has built in sway control.
I carry my Ultra Classic in the garage but notice you have two bikes listed so you probably have more weight behind the axles and that could be why you are light on tongue weight.
Last year when fully loaded for a week long trip, I had my unit weighed ~ you may want to do the same to see if you are exceeding the tow capacity of your tow vehicle and also check the tongue weight at the same time. There are ShureLine scales on fleabay for that or the above mentioned method of using a bathroom scale.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.