How trailer jack sizing works
Tongue × 1.25 rule, 5k/8k/12k ladder, and weld-on safety.
Trailer tongue jack sizing
Trailer tongue jack capacity calculator
Enter trailer tongue weight in lb. Get the minimum jack rating (tongue × 1.25), then a 5000 / 8000 / 12000 lb class — or NO_MATCH. Confirm dynamic vs static rating; weld-on needs competent welding.
Trailer tongue jack sizing
Result
Required ≈ tongue_lb × 1.25. Classes: 5000 · 8000 · 12000 lb. Above 12000 lb required → NO_MATCH. Confirm dynamic vs static rating on the listing; weld-on needs competent welding; chock wheels; never exceed nameplate.
From measurement to decision
Open the full calculator
Same tool with room for examples.
5k vs 8k vs 12k classes
When each class fits — and when none do.
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