The weight capacity of the Dexter EZ Flex Kit part # K71-652-00 is per axle and not the total trailer axle capacity. So up to two 6k rated trailer axles. view full answer...
Based on my research it looks like your 2006 Forest River Surveyor ST262 is equipped with two 3,500 pound axles. This matches up to the 10 inch x 2-1/4 inch brake assemblies that you said are installed.
For replacement self-adjusting electric brakes the etrailer.com Electric Trailer Brake Kit # AKEBRK-35-SA should work perfectly. These assemblies feature the standard 4 bolt pattern for these sized brakes with holes that measure 2-7/8 inches apart, on center. Most likely this matches your... view full answer...
According to my research, AL-KO 8490 references an AL-KO hub for 3,500 lb axles with a 10 x 2-1/4" drum and a 5 on 4-1/2" bolt pattern. For a drum assembly that will work with these hubs I recommend taking a look at the Electric Trailer Brake Kit part # AKEBRK-35-SA for self-adjust or part # AKEBRK-35 for manual adjust. view full answer...