The OP said he was looking at the Bogart 30 amp PWM to run his 24v 335w panel but that only works if his batteries are 24v. He needs MPPT for its buck converter to do 24-12, and he already has an MPPT 20 amper.
335 aimed at high sun should get at least 335/130 x 8.2 = 21 amps, but most of the day, lower sun or panel not aimed, amps will be under 20. Any MPPT can handle over amperage to some degree--not PWMs though at least not for long as they heat up and fry.
The 360 worth of 12s on the Airstream will be fairly flat? ( but is there a flat spot on an Airstream? ) Could be 23 amps aimed but under 20 flat. He could use his MPPT 20 amper on those (in parallel of course) but he must have MPPT to use the big panels with the 12v battery system however they are aimed.
A 30 amper for the single 335 would be ok even if aimed (as he might do as a portable) even the 20 won't fry. If using both panels, just price a single 60 MPPT vs two Tracer 30s (which can be in parallel on one battery bank)
However it is all just weird with no scenario for how much solar is needed.
