My 2015 Precept 35UN has a very loose dash top. You can see it hopping up and down more than an inch on bouncy roads. I do not believe there is any support under the middle. I am afraid to even put my hand there when I wash window. I plan to get under there this winter (too hot to work right now) and see if I can mount a strut under it. The Precept dash is either a very poor design or Jayco forgot to install any support in my rig.
2015 Jayco Precept 35UN
Towing JEEP TJ with Roadmaster plates and bar w/Blue Ox Patriot brake
an Aluma low bed trailer with HD Road King and/or Polaris RZR onboard