Some have come up with portable supports that they can use under their off-loaded TCs. Just keep in mind it has to be something that you can transport with the TC while traveling. Some TCs are built to use un-supported while just resting on their jacks. It depends on the make of TC.
I prefer to still use some kind of support system under the TC, along with the factory jacks. I made a portable system using (3)2X4's,brackets, and aluminum jack stands, and a anti-sway stabilizer bar (that I already had). Everything breaks down and stores inside the bed of the truck along the bed when Im traveling. I can make adjustments for uneven ground by using the jack stands and stabilizer. This gives the under belly support on both ends and in the middle. We lived in and out of our TC for a month and a half while using this system and it was just like the TC was sitting on a solid floor.
Whether its on jacks, or other supports, you should not worry about the thing tipping over with people in the cabover.
