You don't want the uvb obstructed for a T 8 - a glass tank is going to be too heavy to pack around all the time - that is why I suggested you leave him in one place -
The goal would be to leave the 40g breeder at the second residence instead of the 20g tank that is currently there.
If you aren't able to leave the 40g breeder in your other home so that you don't have to travel with it, you should look into a lighter weight option such as a large plastic tote.
The best lighting in the world isn't going to help an adult dragon in a 20g enclosure. In a space that small, the dragon is not going to thrive. It needs more space.