I must have missed where you plan to use the gas strut but I assume on the swing arm similar to the 4x4Labs design? One thing that I have noticed with mine is that the struts under the swing arms are a PITA in the winter. You have to be careful of ice buildup on the bumper as to not destroy the struts. I have to always close mine during storms or be sure to clean the bumper off good right away in the morning. Then wash it more often in the winter to melt off ice. Long road trips can pose issues occasionally too during storms.
Speski OffRoad LTD, Cargo Solutions for Toyota 4x4's http://www.SpeskiOffRoad.com
"80 series, with a fridge"
1976 FJ40, Project with little progress.
2004 Starcraft 10RT