Hello!
I'm Margolys Omaña, Architect, Interior Designer and Landscape Designer. Among the variety of projects I have done, some are similar to yours in location and space: a mobile workshop for bicycles, a motorhome and a jewelry store in a minilocal of 2m x 1.8m.
I have 10 years of experience working remotely and can offer you a spatial solution to your food cart. The temperature must be handled with cross ventilation, natural and artificial; with open spaces, double roof, double wall and parasols with utility, for example, doors.
I have many ideas, if you are interested, you can contact me.
I am at your service,
Arch. Margo Omaña