Welcome to the Jayco forums!
One of my sister's has a 23B Jay Feather, and another sister use to have a 29N LGT Jay Feather. Just a couple of thoughts come to mind:
* Check the tire clearance with the top of the wheel well under loaded conditions. This current thread will give you a little insight: http://www.jaycoowners.com/showthread.php?t=4821&page=2
* Watch your ground clearance under the sewer drain, on some models it can be an issue hooking up the hose on irregular ground surfaces.
* Like any TT, check all the roof seams, vents, windows, side marker lights, etc, twice a year to insure that the caulking is in good shape.
Here are the published specifications on your 2008 JF LGT 311:
Unloaded Vehicle Weight 6,555 lbs
Hitch Weight 820 lbs
Gross Vehicle Weight 7,850 lbs
Cargo Carrying Capacity 1,420 lbs
Exterior Travel Length 32' 11"
Exterior Height w/AC 125"
Interior Headroom 78"
Fresh Water Capacity 36.5 gals. (includes water heater)
Gray Wastewater Capacity 52 gals.
Toilet / Black Wastewater Capacity 22.5 gals.
Following is a pdf file link to the 2008 Jay Feather brochure if you want to print it out: http://www.jayco.com/pdfs/prod_brochure_filename_36.pdf