Are Trailer Ramp Door Spring Dual Spring Twice Capacity as Single Spring

Updated 11/17/2025 | Published 12/10/2024

Question:

Hello i am just making sure that i understand how the ratings work. if a single spring assist is 150lb of assist if it were dual spring is it the same amount just less tension/spring rate? not sure why i am under the impression it might have more lift. thank you for clearing this up!

asked by: Rene G

Expert Reply:

Hey Rene, so the ramp door springs like the part # M394FR are not all identical in spec and capacity. So what that means is a double spring setup does not mean it's just the same spring on both ends compared to a single spring. This is why the capacities do not just double compared to a single spring.

expert reply by: Jameson C

Jameson C.

11/17/2025

Hey Rene, did the explanation about how the dual ramp door springs share the load make sense for your setup? Knowing how that worked out could help others trying to match spring capacity for their trailer doors.