I will probably use some Speakon connectors on every cable and a bulkhead model on the trailer.
Speakon connector - Wikipedia, the free encyclopedia
Mainly because I have a lot of them and a lot of big heavy cables already terminated with them.
I have used these for years with Portable Solar
for Ham Radio applications and overall they are just a nice heavy duty, high current,self-cleaning, locking, watertight connection.
I might use a short adapter from the MC4 to Speakon so I don't change the panel in any way to do it,but I might not too,the fewer connectors the better usually.
I think I will likely set things up like Mike did with a panel on the trailer roof and an external input on the trailer for additional panels placed more directly in the suns view.
I already have a few panels I use for this for Radio work and I mount a cheap meter on the back of the panel so I can use the meter to aim the panel for maximum output at the moment I put it up.
I also need to find a spot to mount a couple more batteries on the trailer to make this all worthwhile.
My charge controller is designed to charge and maintain 2 separate battery
banks independently and has a remote panel for inside the trailer.
I am usually plugged into shore power but the details and practicality have rarely influenced me before and I don't see that starting now!