I would suggest you use FOUR of the Reico-Titan jacks. From the looks of the mounts in your photo you should probbly switch to the ones from Reico. Be sure to fabricate a steel or aluminum plate that matches the holes on the Reico mounting brackets and place this inside the camper. As usual, use sealant on the bolts that hold each one of them in there. If there is any way to use a round headed carriage bolt with the heads IN the camper this will interfere less with the seats-to-bed transition and the seats will lay flatter as they should. Use sealant around the bolt holes and around the perimeter of the bracket where it is attached to those bolts so no moisture can infiltrate and start to soften the wood. Try to use bolts that do not extend too far past the nuts unless you would like to use them for mounting something at a later date.
Check out the Reico brackets, they have a place to mount your Happijacs as well! (unless you are constantly installing and then removing the Alaskan, I think it better to remove those very expensive Titan jacks and store them in a safe, weatherproof location until the camping season is over if you intend on dismounting for winter)
Time for a brake shop to check the truck brakes but if you can see brake fluid leaking down from the brake drum or splattered on the wheel rims then that diagnosis is probably correct unless you have a damaged brake fluid line.
By the way, since those brackets MIGHT be I the way, if you are considering replacing the Pirelli seal, once you remove the old brackets, that would be a good time to do that project!