Hi,
you can use a 2MB-"trapdoor"-memory (incl. 0,5MB Chipram-expansion)
expansion and an axpansion with 8MB at the side expansion slot
at the same time.
The "trapdoor"-ram (also called: ranger-ram) will be adressed
at $c00000 and up and the side expansion will be located
at $200000. So no adress conflict will accur and it will work fine. :-D