The fitment engine: safety rules the UI cannot override
A rooftop tent raises the centre of gravity and loads the mounting points with two sleeping adults on top, so the engine is deliberately conservative and every rule is enforced in code: a missing capacity means ask a human, never pass; a vehicle's static rating is never derived from its dynamic rating (that shortcut is a rack-maker guideline, and applying it to a vehicle roof is the most dangerous mistake available here); the ladder is never credited even though it really does carry load; clamp feet and unsupported raised rails hard-fail before any arithmetic runs; and the lower of the rack and vehicle rating always binds — the result says which one did.
- Before
- Which tent fits which truck was a phone call and a guess.
- After
- A sourced, conservative answer on every product page — or an explicit handoff to a human.
- Every pass names its data source and instructs the buyer to verify against the owner's manual
- A public roof-load-ratings dataset ships with the site
- Hard-fail checks run before any capacity arithmetic



