Check livestock trailer capacity by payload (GVWR − empty weight) and optional floor space so weight and crowding limits are both visible.
Use this before loading cattle, sheep, goats, or pigs for a haul: payload pounds set a hard ceiling; floor area and animal class set a welfare crowding check.
Never exceed GVWR or axle ratings on the door sticker. Hot weather and long trips need more space than a short farm move.
Payload = GVWR − empty − gear. Head by weight = floor(payload ÷ animal weight). Head by space = floor(floor_sqft ÷ sqft_per_head). Limiting head = min of the two when space is entered.
payload = GVWR − empty_lb − gear_lb
head_weight = floor(payload ÷ animal_lb)
head_space = floor(floor_ft² ÷ ft²_per_head)
head_limit = min(head_weight, head_space)
GVWR 7,000, empty 2,800, gear 200 → payload 4,000 lb. At 1,200 lb/head → 3 head by weight. On 80 sq ft at 12 sq ft/head → 6 by space — weight limits to 3.
Assumptions: uniform animal weights; tongue weight and tow-vehicle ratings ignored.
Limits: not a DOT loading chart; species, horned cattle, and weather change safe density.
Responsibility: obey GVWR, brakes, and animal-transport welfare rules; weigh axles when unsure.
On the trailer VIN/certification sticker — do not use a sales brochure estimate.
Rough guides vary: market cattle often ~10–14 sq ft; sheep/goats less; pigs by weight class. Use your hauler’s chart.
Same payload math; check hitch rating and tow-vehicle GCWR separately.