Guys, this is a RED (Rear Engine Diesel).
Here is some information on the 2015 chassis:
http://freightlinerchassis.com/images/pdf/Tiffin/Tiffin%20Allegro%20Red.pdfHere are some pretty universal issues that affect ride and handling:
Have you weighed the wheel positions and/or axles and set tire pressure accordingly? Over or under inflation can sure affect handling.
If you have the weights, please post them and the GAWR (Gross Axle Weight Ratings) from the sticker that is likely near the driver's area.
Look in your book and see if Tiffin recommended having the alignment checked after loading the coach. For sure, check RIDE HEIGHT, as that can affect handling as much as toe and caster.