I really loathe SAE connectors... Ugh. On one end, the exposed pin is positive, on the other, it's negative! Makes it a pain in the a** to make up your own connectors.
For my own stuff, I switched to using Anderson PowerPole connectors. You use the same connectors on either end and just rotate 180 degrees to mate with another cable. They're color coded, too. Super easy.
On my old camper (at the moment, I still have it, picking up the R-Pod 176 this Friday), I removed the ring connectors to the battery and replaced with an Anderson connector. Then I built a couple ring connector pig tails to leave connected to the battery, so I can connect it to the camper, and have one to connect to solar. I have a flexible 100W panel and a cheaper PWM charge controller, that conveniently fits under the battery box cover when in use. I only set it up when at a campsite.
On the R-POD, I may opt for a permanent solar install on the roof, and figure I'll drop the cable down into the cabin, I'm thinking through the antenna hole (will need to research the best point of ingress...) and mount a nicer MPPT charge controller somewhere along the panel with the other electronic bits. Then I can run cable down to the converter below it. That way the solar can be permanently hooked up. I may also wire in a cutoff switch.
Long term, I'd like to mount a couple larger batteries (more capacity) below the rear dinette in the storage area. Maybe 4kWh or more of lithium based batteries (when prices come down), then wire in an inverter and charger. I think it will be awesome when we can get several kWh worth of lithium based batteries for reasonable prices... it will change boondocking quite a bit!