I have two 80 watt panels for a total of 160 watts of solar. It is connected thru a Blue Sky Solar Boost 2000E MPPT controller. The Blue Sky is a 4 stage controller with battery temperature monitoring.
I am not familiar with the frame on the 17 foot Bigfoot
trailers. I thought since the 21’ & 17’ Bigfoot
trailers were the same width that the tongue was probably the same. The tongue on my trailer does not have an indentation. It is a straight V shape.
If you choose just one battery, I think the Trojan T1275 12 volt battery that Steve mentioned would be a very good choice.
My solar system during the winter returns my batteries to 85% or more. This is not really a problem and should be expected, since the last 10 to 15% takes longer to accomplish. The wording “barely keeps up” might have been misleading, but after a summer of camping when our batteries are back to 100% by midday, the winter months are different and we are almost never back to 100% by end of daylight. This is mostly because of fewer daylight hours for charging and our usage is higher.
On another note, I agree with Steve about maximizing the charge available from existing solar panels using more sophisticated (and more expensive) MPPT controllers. The MPPT controllers will increase output up to 20% and for me it was like adding 32 watts of solar (20% x 160watts), which would cost approximately $160.00. It made economic sense and helps with the limited real estate for panels.
Camping life is good with solar, Dean