2008 KEYSTONE COUGAR Visibility Problems

WE CURRENTLY OWN A 2008 29 SAB KEYSTONE COUGAR 5TH WHEEL TRAVEL TRAILER. KEYSTONE ISN'T RECOGNIZING A HEATING SYSTEM PROBLEM WITHIN OUR UNIT, SUBURBAN SF-30F MODEL FURNACE. I DON'T BELIEVE THE PROBLEM IS WITHIN THE FURNACE, YET. HISTORY IS FOLLOWING: FRONT FLOOR REGISTERS PRODUCE 20 TO 0 CFMS, BACK RV REGISTERS PRODUCE 80 TO OVER 150 CFMS. TEMPERATURE DIFFERENCE ARE UNSAFE, WITH THERMOSTAT PLACEMENT AT THE FRONT OF THE RV. IT COULD BE A DUCTING PROBLEM WITHIN THE UNIT OR PROBLEM WITH THE FURNACE ITSELF. OUR DEALER, A LOCAL HVAC COMPANY AS WELL AS DUCT LAYOUT SPECIALIST FROM INSCO. INC. HAVE FOUND PROBLEMS. ALL CFM MEASUREMENTS HAVE BEEN RECORDED BY TWO PROFESSIONALS IN THE HVAC INDUSTRY AS WELL AS OUR DEALER, CRESTVIEW RV. WE AND OUR DEALER CONTACED KEYSTONE REQUESTING REMEDIES THAT WILL NOT VOID WARRANTIES, KEYSTONE REPEATEDLY STATES OUR UNIT IS WORKING TO MANUFACTURER SPECS, EVEN THOUGH THE DEALER...