"Lightweight truck camper" is marketing language without an industry- standard definition. In practice it means somewhere between 500 lb and 1,500 lb dry, depending on the format and amenity level. Three weight classes track to three real product formats:
Truck-bed toppers — 400 to 700 lb dry. Bed-rail shells with sleeping platforms; no plumbing, no heat, no built-in interior. The lightest end of the category. Best for weekend trips and warm weather.
Pop-up truck campers — 500 to 1,500 lb dry. Lower shell with soft fabric or thin composite side panels and a roof that lifts at camp. Three-season standard insulation. Lighter than hard-sides and significantly lower-profile for driving, but soft panels lose more heat than a rigid wall and the lift mechanism is a maintenance item over the long term.
Lightweight hard-side truck campers — roughly 800 to 1,200 lb dry. Fixed walls, full insulation, integrated kitchen and bath options, always-deployed interior. The Kimbo 6 (~830 lb base dry) sits at the lower end of this class; most other hard-sides in the lightweight tier land in the 1,000–1,200 lb dry range.
Standard hard-side truck campers — 1,500 to 2,500+ lb dry. Composite-wall construction (welded frame plus laminated wall panels). More cabin volume, more amenities, more refinement — and more weight. Not lightweight. Targets full-size and HD trucks where the payload can comfortably carry it.
The lightweight question is really "which format gives me the right trade-offs at the lowest weight that does what I need?" — not "what is the lightest camper, period." The answer depends on whether you need fixed walls, an always-deployed interior, four-season capability, and security when you're away from the camper. If yes to those, you're in the lightweight hard-side class; if no, the pop-up or topper class can deliver lower absolute weight at the cost of those features.