With the tongue weight of the trailer and the weight of the topper, the Sumo Springs # SSR-612-47 with a 1000-lbs capacity are the right choice since Sumo Springs are progressively load bearing; this means that they get stiffer as more weight is applied and really do a great job of not affecting the unloaded ride quality. The Sumo Springs are a great solution that install without any drilling required, and they'll replace your factory bumpstops, so now when you bottom out you're going to... view full answer...