A cargo trailer can help an ordinary bicycle carry a large shop or bulky object, but the largest platform is not always the most useful. Start with what you will carry most often. A bag or two of groceries may fit a narrow, light trailer; a crate or long item needs a stable bed and secure tie-down points. Check more than the manufacturer’s load rating: consider how the cargo will be restrained and whether the bicycle’s brakes can safely stop the greater combined weight.
A two-wheel trailer balances on its own and usually suits wider or heavier loads. A single-wheel trailer follows the bicycle’s line more closely through narrow turns, though it often offers less carrying space. Measure gates, narrow sections of cycle paths and the space available at home. In everyday use, the trailer’s outside width may matter more than its theoretical volume.
Before buying, check how the hitch fits your bicycle. A quick-release axle, nutted axle and thru-axle may need different fittings or adapters. Also consider whether the trailer folds or stores easily when it is not in use. A trial ride with a similar load shows how acceleration, braking and cornering change. Cargo trailers are designed for goods; carrying children requires equipment built specifically for passengers.