Exploring my QRP options for bumpy travel

I've made several short excursions with three of the following QRP rigs (except for the Currahee, which I just received today) and am considering which of the four to carry with me on longer trips like the TAT and various BDR's.Conditions would be: Bumpy riding, likely to fall (I hate riding in deep sand!), exposure to heat and humidity.I operate only CW and would like to activate parks (and