Building the 'expedition' box - looking for ideas and input

[Avo]

Design a 'clip on' Wheel and Handle accessory that can be purchased separately sama sama tie downs, racks, joining clamps etc. as prev mentioned on other pages.

More money in it for you and you don't have to have different boxes IE one with wheels and one without

yep if you are going fopr an interlocking system like a sea container where the only one secured is the base box...you could make clip on wheels that fit in the interlock bit easy accessory and build into design