+1. My panel is right behind the right wheel also and I've never had a breaker trip like that, in this or any other RV I've owned. Check to see that the panel cover plate surrounding the breakers isn't misaligned and pressing on them incorrectly. Ditto for the access door. Make sure the breakers are seated in the panel properly. Also, take a look at your axle on the right side and be sure you aren't bottoming out the torsion arm travel. There have been quite a few axle failures in the heavier rPods. 

This is weird.

I may at some point replace all breakers.

Also I might add the breakers are located slightly aft of the right wheel, it seems to me they are getting a straight jolt from bumps in road.

They would have to be so loose that they are broken or worn out...its just not possible to be that loose and still operate correctly.

Yah, and the first gen arc fault breakers in the early '00's were even worse. Just turning on my ceiling fans would trip those, they were totally useless. But the breakers tripping in the trailer panel are just plain old breakers, at least they are in mine. 

I think it's going to take some methodical troubleshooting in order to try to zero in on where the problem is.  I'd start with my suggestion above, connect with the trailer main breaker off, then turn that on and see what happens. Record which breakers trip. Then turn the main off again, turn off all the branch breakers, turn the main on and start turning on each breaker one at a time, noting what's happening. 

Circuit breakers don't just pop for no reason. Especially several of them. Now we have some old-original GFCI breakers in the north annex of our house, which was built around 1994. All kinds of things made those suckers pop. The worst offenders were the old fluorescent lights they originally installed. Our solution was to replace the GFCI breakers, and install GFCI outlets wherever they were needed.

If just one branch cb was tripping I'd suggest that there was either a fault or a bad cb on that particular circuit. But if multiple branch cbs are tripping that's a different story.

Is the trailer main 30A cb tripping? is it always the same branch circuits that have their cb's tripping? 

Maybe try turning off the main 30A cb in the trailer, then plug in to your house circuit, then turn on the main in the trailer and watch what happens.

Here lately when I plug my 2018 R Pod 180 into shore power at home or at camp sites I find a few or almost all c/b's popped.  I reset them, and all is good till we break camp and plug in again somewhere else.  Was wondering if this is an early sign of power supply failure, c/b's weak, or something else.

FYI-

When plugging in at campsites I always open pedestal c/b before plugging in to camper, at home I just plug into house and then to camper.  Either way I do it c/b's are popping. 

Any suggestions?