A lot of people are having issues with the current transmitter/receiver being offered with the arrma 4S/6S trucks. Dropping out signal, poor range, issues binding, having to rebind frequently, etc. The previous trucks came with a tactic system. The newer ones come with a low end spektrum stx2 system.
There are a few systems around $100 that are worth having. If this is your first RC and you intend on adding to your fleet, it makes sense to buy a decent system now and then just new receivers for other trucks later.
I run a cheaper Spektrum system and don't have too many issues. The DX5C. The only frustrating things I have to say about it is the lack of a charge port and the scroll/menu button. I got the DX5C this year I think to replace my DX3C which was 3 yrs or so old and abused. I had to program 8 or 9 trucks into the DX5C, so it was a pain going through the menu for 2 hours setting them all up.
Futaba radio's are known to be pretty good. I would have switched, but having 9 or 10 vehicles, I'd have to buy 8 or 9 receivers, at $60 a piece. But something like the
3PV would be a good unit for a basher like me.
There's a massive thread on the arrma forum regarding chargers:
https://www.arrmaforum.com/threads/recommend-me-a-battery-charger.1079/
And lipo's:
https://www.arrmaforum.com/threads/whats-your-budget-lipo-of-choice.218/
If your going to run 6S, then you need a relatively high wattage charger, especially if you want to charge at 2C (vs the standard 1C). A 6S 5000mah packs takes 5 Amps and 111 watts to charge at 1C. Double that for 2C charging.
This one won't quite do 2C for 6S/5000mah, but it gets mentioned quite a few times in that thread I gave:
https://hobbyking.com/en_us/skyrc-u...-charger-discharger-power-supply-us-plug.html
I run hobbystar 3S 6200mah 50C packs and have been pretty happy with them. I also run HRB 3S 5000mah 50C packs that I bought before the HS packs and they work ok, but don't perform as well. Not quite as punchy throughout the entire pack.
When I started, I ran 2x2S in my first electric (traxxas brushless revo v1), so I got a 4x10A 4x100w charger and it did fine. Now that I'm running 2x3S packs in the big trucks I now have (ERBEv2, outcast, savage flux hp), I still use that charger, but it takes a bit longer as it hits it's 100w cap at about 7.5-8A. I also have a hitec d7 (2x20/2x200w) that I parallel charge 4 packs on. I usually take 8 packs and 2 trucks. I also have a HTRC AC/DC 150DUO in my car wired to my battery that does 2x12A/2x150W for charging when I'm out bashing.
Likely would have been better if I bought a couple more robust DC chargers for home (and another for my car) and just used a couple power supplies at home instead of the AC/DC chargers. You will find a lot of that in that thread as well.