Ah misread some of your post turns out. I have a powerflex adapter which only works with a big jack as its quite a large adapter but nothing wrong with using it, will protect it from getting roughed up, I don't use it now as mine is too low to get it underneath but so I just jack up now with a small thing rubber pad on the jack for grip and some protection. The reinforced seam is strong you are not going to damage it with with trolley jack. If it's metal on metal you may scratch it up a bit and take the seam sealer off like I did which is to protect it from corrosion but its relatively thick strong steel so is not going to rust off anytime soon. I also jack mine up 2 times plus a week almost every week for the last 18 months and still no issues. Garages will jack it up on that reinforced seam whether it's a trolley jack or a lift also.