Indiana Code Title 9. Motor Vehicles § 9-13-2-150

(A) a truck camper;  or

(B) a mobile structure (as defined in IC 22-12-1-17);  and

(A) is designed and marketed as temporary living quarters for recreational, camping, travel, or seasonal use;

(B) is not permanently affixed to real property for use as a permanent dwelling;

(C) is built on a single chassis and mounted on wheels;

(D) does not exceed four hundred (400) square feet of gross area;  and

(E) is certified by the manufacturer as complying with the American National Standards Institute A119.5 standard.