Don't over think it, but honestly I would need some help to give you the best answer. Below is a rough drawing of what you may have (in my mind at least).
I expect that you would like to be able to use the panels on the trailer when at camp etc. I would need some confirmation or pictures of how your existing rigs are wired, and then we can come up with solutions.
The two areas that are circled are the areas of interest. Specifically the connections on roof of the SMB and what is on the back of the suitcase 60 watt package.
Any information on the vendor, etc or specification that you received with the products are pretty much needed. It would be nice to have the specifications for all the panels. The information looks like this and is usually on a sticker on the back of panel.
Max System Voltage (IEC/UL) 600V
Maximum Power Pmax 180 W (0%, +3%)
Voltage at Maximum Power Point Vmpp 19.67 V
Current at Maximum Power Point Impp 9.15 A
Open Circuit Voltage Voc
24.06 V
Short Circuit Current Isc 9.77 A
Module Efficiency (%) 18.0%
Temperature Coefficient of Voc -0.28 %/ºC
Temperature Coefficient of Isc +0.04 %/ºC
Temperature Coefficient of Pmax -0.38 %/ºC
If you can help fill in the blanks for us, we can help.
-greg