Enrique Giner, the automotive veteran behind Modular Truck Gear, built the ADV-BOX around a fairly simple idea: a truck cap should go on and come off on your schedule, not the cap’s. Your truck gets its cap back whenever you need it, and your garage gets its wall back when you don’t. MTG claims the ADV-BOX is the first hard-shell truck cap with a fully integrated roof rack system that attaches to the cap brackets rather than bolted on as an afterthought. The entire rack comes off alongside the modular panels during removal, keeping the whole system logically consistent from top to bottom. LEER, the biggest name in truck toppers, launched a modular cap of their own called the NexCap in late 2025, starting at $3,149 in precision-formed aluminum at roughly 240 lbs assembled.