Help Wiring New Converter to Motorhome

Well I'm. In the process of installing more gel batteries with a 30 amp switch and 30 amp fuse. My intent is to disconnect the batteries when driving or when plugged into 120 than flip the switch when parked to allow the solar panel charger that is already hooked up to maintain them. I also bought a gel battery charger which is a smaller unit which I can use to charge the starting battery should I need it. I'm connecting the batteries in pararel with 10 awg wire and lugs, with an 8awg grounded to the frame. I have another 10 awg running about 3.5ft to the dc distribution panel with a switch and a fuse in between. I will hookup two additional gel batteries in the rear of a the motorhome on a hitch mounted box with 6 awg for the power and you awg grounded to the frame. Will the 10 awg spade suffice for up to 30 amps?