The trailer question eats more paddock group-chat bandwidth than gearing and tire pressures combined: enclosed or open, small or big, or skip it all and buy a van. The honest answer is that the format matters less than four specific things, and you should rent before you buy anything.
Load height and the ramp
The most underestimated number in the decision is load height — the height your kid's bike (and your back) has to climb. A low deck means short ramps, calm loading, and no drama in the rain; a tall enclosed means long ramps, a steeper walk, and a moment of physics every time a tired eight-year-old rides up it. Minis are light enough to push up most ramps, but race mornings are early, surfaces are uneven, and the ramp moment is where bikes get dropped. Whatever you consider, picture that moment — wet ramp, crosswind, kid on the bike, you holding a coffee.
Tie-down points and layout
A trailer is a box until it has anchors. Proper floor-mounted, rated tie-down points where your bikes actually sit — not where the manufacturer thought furniture would go — are the difference between a trailer and a liability. Count for your fleet plus one: bikes live in configuration (two minis and a pit bike fit differently than one mini and a gear wall), and the spare anchor is for the day you bring a friend. Our tie-down technique post covers the strap side; this side is just: no rated points, no deal.
Ventilation, wet gear, and the weight budget
Enclosed trailers ovens on hot days and sweat boxes on wet ones; whatever you buy needs airflow for the drive home with damp leathers, muddy boots, and a wet canopy — or you will meet the smell next weekend. Open trailers solve ventilation and budget but solve nothing for rain, security, or sleeping arrangements at two-day events. Wet gear storage is its own discipline: bins, not piles, and a plan that keeps the dry stuff dry. And the boring essential: total weight capacity of trailer plus tow vehicle, with bikes, fuel, tools, canopy, generator, and the gear wall you have not built yet. Payload is the budget you spend before you know it.
The van question, and renting first
A van is the answer when the calendar is full: weatherproof, lockable, sleepable in a pinch at far rounds, and nothing to store in the off-season because it is also the second vehicle. The costs are purchase, fuel, and parking a box all year. The trailer's answer is flexibility — swap vehicles, store it, lend it. Both are right; the mistake is buying either on forum advice instead of seat time. Rent the enclosed for one round and borrow the open for another, and notice what you actually reached for. The cheapest trailer decision is the one made after two race weekends, not before zero — rent before you buy, and buy for the paddock you actually run, not the one you imagine.