In principle 64-bit LispWorks can grow to almost 16TB but it is intentionally limited to a defined range in order to avoid clashes with other software as shown in Default range for 64-bit LispWorks heap.
64-bit LispWorks is relocatable on all supported platforms as described in Startup relocation of 64-bit LispWorks.
In contrast, 32-bit LispWorks has a maximum heap size of 1.5-3.0GB depending on platform and is relocatable on non-Windows platforms only, as described in Startup relocation of 32-bit LispWorks.