I agree with Sean45 that you are well within the towing/loading limits of your tow vehicle with a loaded trailer weighing 5,500 lbs. The only time you MIGHT notice a slowdown would be pulling the trailer up mountains that are in the 1,000 feet range. For every 1,000 feet in elevation you climb your tow vehicle loses 3 percent of its towing efficiency. At 10,000 feet your tow vehicle could pull 5,500 lbs but it would be straining.
Having pulled two different trailers in the Rocky Mountains with a tow vehicle that was straining, I would do it again in a heartbeat because MOST of our towing was at lower elevations. I would rather have the added creature comforts of the heavier trailer rather than settle for a lighter weight trailer just because I want to tow in the Rockies once a year.
Just my experience and preferences.
Emeritus Member of Jayco Owners' Forum