Have you looked in the FreeBSD/i386 Hardware Notes?
http://www.freebsd.org/releases/6.2R/hardware-i386.htmlDo you mean Trendware instead of Trendnet?
These Trendware NICs are supported, but your's doesn't seem to be in the list
TEG-PCITX (32-bit PCI), TEG-PCITX2 (64-bit PCI), and TE100-PCIE.