Yesterday I pulled the calipers off ours for a set of new pads and used the 3 Ton trolley jack for one. I really had to lean on the handle in an awkward position. The other three got the tall 12 Ton bottle jack. One hand and not as many pumps as I had recalled from previous underside work. I also used a jackstand just in case - and yes, it went under the axle but with no weight on it since it was a safety backup.
Use whatever you want that's within the capacity to lift your trailer but this discussion and doing that little chore yesterday reaffirmed my decision to go with a 12 Ton.
$18 for a 4 Ton
$26 for an 8 Ton
$30 for a 12 Ton
https://harborfreight.com/automotive...tle-jacks.html
Then there are those coupons which make them even less
https://www.harborfreight.com/savings_coupons.html
Using the self leveling feature is probably OK in a safe, level place like your driveway but alongside the road, changing a flat may not be and possibly why Lippert issued a CYA