Oops! Jens, you forgot the swap partition. Paragc, create a small swap partition (equal to or greater than the amount of ram on your motherboard). Otherwise, following Jens instructions should work.
Install RH first, write grub to the RH partition. Then install SuSE and write grub to the MBR. It should detect the windows and RH partitions and correctly write the grub config for windows, RH, and SuSE.