Congratulations on the new Eagle and welcome to the JOF.
Hopefully someone here may be able to help, but did you check with Jayco? It seems they could easily resolve the mattress size question. Quality? You may have to sleep on it and judge for yourself.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.