Modular truck cap apparatus

An apparatus for covering at least a portion of a cargo area of a vehicle, the cargo area comprises a pair of opposing side walls that include a first side wall and a second side wall, the apparatus comprising:

• a frame structure comprising:
• i. a first lower support configured to be attached to the first side wall,
• ii. a second lower support configured to be attached to the second side wall,
• iii. a forward first pillar extending upwardly from a forward end of the first lower support,
• iv. a rear first pillar extending upwardly from a rear end of the first lower support,
• v. a forward second pillar extending upwardly from a forward end of the second lower support,
• vi. a rear second pillar extending upwardly from a rear end of the second lower support,
• vii. a first upper support connecting the forward first pillar and the rear first pillar,
• viii. a second upper support connecting the forward second pillar and the rear second pillar;
• one or more panels comprising one or more fasteners extending from a back or B-side of the one or more panels;
• wherein the frame structure comprises one or more openings and the one or more fasteners are configured to extend into and through the one or more openings and into the frame structure to attach the one or more panels to the frame structure;
• and
• wherein the one or more fasteners comprise a first portion and a second portion, the first portion having a pair of opposing grooves that are arranged at an angle or on a ramp and are configured to mate with a pair of corresponding projections arranged at an angle or on a ramp on the second portion.