I have written and posted at one time two articles that deal with the basic premise behind this post.

Carrying a bigger BOB. That deals with designing carts and options for carrying more equipment or persons that have limited mobility. I.e. young children or elderly.

Alternate Bug out Vehicles. This includes other forms of transportation. Such as boats, standard bike options as well as rail bikes and converting a standard motor vehicle for use on railroad systems.

Finally I have the basic design of a rickshaw like cart.

Anyone that would like copies can send me an E-mail address via the PM system. I can then send them to you as a set of attached word documents.