I got my Quickjack 5000TL and assembled it last weekend. Works great. The key to assembly is reading the directions completely before actually building the thing. Bleeding the lines is critical. Quickjack provides a thread sealant because apparently many people don't know how to use PTFE thread tape the right way. I used PTFE thread tape and had no issues. Quickjack says you can use it if that's your preference. I watched so many Quickjack build videos and fails and saw so many people not following the directions. They put sealant on threads QJ specifically says not to, they overwrap the threads in PTFE, they way overtighten the fittings, they don't position the jacks correctly for bleeding, etc.
I got the 5000TL so I could lift my Cayman (2940lbs), M235 (3400lbs), my wife's 2020 4runner (4600lbs), son's 2020 Mazda 3 (3200lbs), my daughter's 2015 Outback (3700lbs), and possibly a single cab/2WD 2024 F150 XL (5.0 V8; 4100lbs), if I replace my M235. The Outback is the only vehicle it won't fit. I'll need to get the extension bars as the Outback jack points are a couple of inches too wide.
When not in use, I push the Quickjacks together and park over them with my Cayman.