FYI this was my experience with my '84 King shocks. When I got the coach in 2009, it had the original Carrera 3175 rear 4 shocks, and 2 Rancho replacements on the front. The front would dive and easily bottom out often, while the rear (walking beam) tandem axles rode okay even though the Carrera (now called QA1) shocks were worn out.
These QA1 rebuildable, tuneable racing shocks were made for Daytona races, not 5,000 lb axles. Original equipment was all 6 Carrera 3175's, so the front end was obviously under-controlled from the Revcon factory. These OEM shocks may have correct retract/extend dimensions, but the requirement is similar to other small Class A and medium truck front axles needing greater (300+ lb) damping ability.
Otherwise, there is no need for Bilstein expense, so I checked Monroe, Gabriel, and other makes for a cost effective solution. I chose Japanese KYB, a high quality OEM source for many vehicles that is bargain-priced. For the front, KG6406 will work with the usual upper mount and grommet mod, while for the rear tandems, their lighter duty KG5538 is adequate. With stronger damping, the lower front shock mount will need to have the reinforcing mod done as well.
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