Congratulations! We have the very same model and year. Check here under "Community" tab. There is a Seneca First Generation Owners' Group in there with some valuable information from the group on things they have found helpful on our units.
The Seneca does have sway bars, but some folks choose to put heavier bars on as an aftermarket mod. Heavier springs are common also, as are overload devices. The chassis around this time period were built with springs for something around 9k or 10k lbs. In reality, the often see 13 minimum and sometimes more like 15k lbs. There is a mod that Jayco would do using Hellwig springs for original owners. They also did some with air spring assist, which is what mine has. Good luck with your unit, and happy trails!
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2006 Jayco Seneca 34SS
2006 Jeep Wrangler Unlimited Rubicon Toad
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