There were some issues with ground clearance on some of the lite model TT's, namely the sewer drain pipes and the angle at the connection point (on some). They could get damage during minor bumps in the road and were at times difficult to hook sewer hoses up to. Jayco actually had an option for a 4" riser for a couple of years on some of these models. My sister had a 29N and always had issues with her sewer piping getting damaged (didn't have the riser, but tire clearance wasn't an issue).
As far as your tire clearances, this was an issue with some axles and Jayco was taking care of it under warranty. The axle manufacture recommends that the clearance be 3".
IMO, the axle R&R has to take place for safety reasons, and I would highly consider the additional 3" riser while it's being done. Check the sewer connection clearances on other TT's at the dealer, compare them to the '08'
29D.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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