I wanted to check in one more time , My Dad has the same 2007 sunline you have. We just did a 4 shock kit and dexter EZ ride center spring hanger . Going over 4" tall speed dumps dont effect the back of the truck like it did stock , infact it almost doenst move the truck at all. From the factory the trailer wold bounce the truck around on uneven roads or bridges / speed bumps ect. The shock kits came from Monroe or you can use dexter kits also but the shocks on the trailer make a HUGE differance and add the EZ ride kit stops all the sharp bumps from go back into the trailer / truck. Truck shocks are important also but the trailer shocks make for a nicer ride in the truck.
2001 Holiday Rambler 31' cks 10000 lbs loaded
2006 2500hd duramax/allison crew cab