Every electric trailer dolly gets a score from 0 to 100% built from five factors, which maps onto the 5-point rating shown on the site (a 0% score would be 1.5 stars; a perfect score, 5). Each factor is scored against fixed reference points, not against the other products in the list, so adding a new model never moves another model’s rating. Units are grouped by trailer weight: under 4,000 lb, 4,000 to 6,999 lb, and 7,000 lb and up, and use the same scale in all three.
| Factor | Measures | Weight |
|---|---|---|
| Value | price per 1,000 lb of trailer weight | 30% |
| Capacity | trailer weight the unit is rated to move | 20% |
| Motor power | motor wattage | 15% |
| Features | remote, battery, brake, trailer connector, overload protection and speed control | 25% |
| Warranty | warranty length | 10% |
Where the numbers come from
Capacity, motor power, battery, features and warranty come from the maker’s product copy, including the maker’s own copy on a retail listing. Where a listing contradicts itself, the conflicting figure is left out rather than guessed. Prices are checked at Amazon and the lowest price at a store the page links to is used.
The factors
Value is the current price divided by trailer weight in dollars per 1,000 lb, on a log scale. $450 per 1,000 lb scores zero and $40 per 1,000 lb full marks.
Capacity is the weight of the trailer the unit is rated to move: 2,500 lb scores zero and 10,000 lb full marks. It is not tongue weight and not a jack’s lift rating. Where a listing prints a larger maximum in the title and a smaller rated working load in the text, the working load is scored and the title figure is shown on the product page.
Motor power is the motor’s wattage, summed across motors: 350 W scores zero and 1,150 W full marks. A motor with no published wattage is scored neutral.
Features is 25% for a wireless remote, 20% for a battery on board, 20% for a parking or active brake, 15% for a trailer connector (7-way plug, brake controller or light port), 10% for overload protection and 10% for variable or two-speed control.
Warranty is the maker’s warranty: 1 year scores zero and 3 years full marks.
What isn’t scored
Tongue weight, voltage, battery size, speed, drive type, slope rating, coupler height range, unit weight and release date are listed but not scored.
Missing data
If a figure isn’t published, that factor gets the neutral middle score (50) and the product page marks it as estimated. Features score neutral only when none of them is published; a feature the maker doesn’t mention otherwise counts as absent. Warranty is the exception: a maker that doesn’t publish one gets no warranty counted, so that factor scores zero and is marked estimated.
Ties and discontinued models
Products are ranked by score within each group. Discontinued models stay listed but rank below every current model and can be hidden with the “Hide discontinued” filter.