I store a modern bottle jack similar to whats pictured above under the seat of my '50. Very compact to store away along with it's crank handle. Most importantly, works great.

Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.