Wheel change on a 2002 Jayco Outback Finch

[cruiser 91]

I'm about to swap the original wheels 235/70/15 over for 256/75/16. The camper has over slung leaf suspension. No jack points and is not hitched to my vehicle.
I'm using a ARB exhaust jack but not sure where to place it. My main concern is tipping the camper whilst to not hitched.

Any ideas for the best place to put the exhaust jack?

Cheers in advance.

[cruiser 91]

All soughted.....................but wasn't easy. As my camper did not come with a jack I had to source one, the exhaust jack wasn't going to cut the mustard. No camper places sell a jack to lift higher than 400m, including Jayco!!!!!!!!!!!!! I need a lift of 650mm plus.

Ended up buying a high lift jack and a few HD stands.

Cheers