I have the smaller Aspen Sentry, actually. I also have two other trailers. The trailer doesn't matter as far as the rear suspension settings go, however. First, the Spyder RT is limited to 40 pounds of tongue weight, no matter what, so there is no need to adjust for added tongue weight. Second, the tongue weight is not suspended...it rides on the hitch, which is attached to the swing arm. It doesn't move when loaded. Push down on your hitch versus pushing down on the rear trunk and you'll see what I mean. Finally, the auto suspension will adjust for added weight, to maintain ride heght, so there is no need to make adjustments unless you want it to react differently. It will compensate for a passenger or cargo...al by itself.