This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
箽 combines 竹 (bamboo) with 重 (heavy). The exact historical development is uncertain, but it likely originally referred to a type of bamboo or bamboo implement.
Bamboo 竹 on top of something heavy 重 suggests a sturdy bamboo pole or tool, but the exact meaning is unclear.
For トウ, imagine a heavy bamboo pole that makes a deep 'toe' sound when it hits the ground: toe -> トウ.