Competition RV has worked on my 5er. I am happy with them. They are just off I 76, west of Denver (off Federal).
(303) 456-2699
TransWest might be worth checking out for the chasis service. They are north of Denver, off I25 south of Longmont.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010