Greg, good questions here's my reasoning and take.
1) Good to hear you're going with 1000 Solar Watts. You asked for "more then enough" and while the correct answer depends on your load and location and all sorts of parameters a 1000 watt system is relatively big in many typical dry camping RV applications even if some only run 200 to 500 etc. I have NEVER run out of energy when dry camping with my 715 Solar Watts and four Trojan T-105's and I run an extra 120 VAC fridge 24/7 and a CPAP each night plus the usual TV and electronics and charging and vent fans and water pumps and furnace etc...When I only had 400 solar watts or maybe only 225 Amp Hours of battery energy storage (Two Trojan T-105's) I could NOT get by as I stated above
2) ONE reason I recommended Trojan T-105 is THEY ARE SO STANDARD AND SO RELATIVELY AVAILABLE in soooooooooooo many locations across the US. You can get replacements or warranty etc. sooooooooo easy as compared to many other brands.
3) I recommend that ALL batteries (regardless of brand) be the same type and brand and size and age.
4) I used the Sams Club batteries in a past RV and didn't like them as well as the Trojan. NOTE that was my own personal experience and would expect some others may have had a DIFFERENT experience or opinion and actually that's to be expected, to each their own. I recommend Trojan over the one Sams sells even if on paper they are equal, do as you please, its your money and your choice. Other brands I would consider are Crown and Rolls Surette in addition to all those generics sold at Sams or Costco or Interstate Battery etc etc.........Last time I looked many batteries were made by Johnson Controls or Deka etc just had different brand labels lol.
5) That's a typical price I've seen for the T-105 but I'm sure if you shop around you may find them closer to $100.
6) I considered their solar or renewable energy battery but didn't consider the extra cost gave you more bang for the buck. ALSO they are less readily available and NOT a common in stock unit if you had a problem or only one went bad. However if one of the T-105's went bad you can pick up a replacement so easy.
7) Of course if you're going with 6 volt batteries I recommend 2 or 4 or 6 etc set up in series parallel for the 12 volt RV system AND THE SAME BRAND AND SIZE AND TYPE AND DESIGN AND AGE, regardless of the brand you use.
ACTUALLY since you're starting from scratch (what I will do next round) is to consider the use of AGM batteries versus flooded lead acid. Sure they cost a bit more, but there's less venting concerns and problems and mounting location considerations etc etc versus flooded lead acid. I have been looking at Lifeline and FullRiver in the AGM type if I ever revamp my system.
For your 1000 watt system and Class A and based on PURE GUESS not knowing your use and loads etc I recommend AT LEAST 450 Amp Hours of energy storage (that's four Trojan T-105) and really if you had 600 to 700 or more amp hours THAT MAY WORK BETTER FOR WHAT YOU HAVE but that's more money and re weight and requires more storage AND DEPENDS ON YOUR USE AND LOADS.
Shop around, do your homework, read some reviews, listen to the opinions and advice offered here THEN MAKE YOUR OWN CHOICE
John T Retired Electrical Engineer but NOT a solar expert
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