This one should work, right?
Here's a 60w PD power bank that should charge in a couple hours. It only holds 20AH and when charging and discharging that quickly the number of cycles will be reduced. But for the money its the fastest charging one I could find on amazon so you could get a couple. You'll also need a 60w PD wall charger too. So if you already have a bunch of power banks you could get a duffel bag with a power strip in it and everything already plugged in. Just be careful of all the heat in the bag because those 60w chargers get pretty hot.
You could also get a 60w PD car charger or a low wattage pure sine wave inverter to charge while driving. Just make sure your 12v outlet is fused to handle that much power.
Edit: There's also this slightly larger capacity (26800mAh) power bank that comes with the charger, but it charges slightly slower (45w).
Edit Edit: There's also "portable power stations" like this that can charge at 100w. But at that price you might as well build yourself a dedicated solar system or at least install a battery isolator on your alternator and get a deep cycle lead acid.
I just bought a usbc hub from Anker and another usbc charger and battery for mine and they all work. What you need to look for is to make sure your charger is about 60w or more output (the apple one is 87w and you'll charge up pretty fast) if you're going to use a hub with a pass through charger so you can power the hub (11w) and your tablet (45w minimum)
Aukey charger AUKEY USB C Charger with 60W... https://www.amazon.com/dp/B079P11LBV?ref=yo_pop_ma_swf
Anker hub Anker 7-in-1 USB C Hub, 4K USB C... https://www.amazon.com/dp/B071JV4NPS?ref=yo_pop_ma_swf
Battery Jackery Supercharge 26800 PD,... https://www.amazon.com/dp/B0791BGYS3?ref=yo_pop_ma_swf
I thinkk the best one is the Jackery that provides 45 watts of PD charge and comes with a wall charger. $100. It also does quick charge from the single usb A.
IF you're looking for a USB C PD charger the best I have found is the Jackery 26800. It is $100. Does 45W through the USC C, and has an additional USB A port that can fast charge 18 W. I know some others have a better assortment of ports or others have higher PD output of 60W. I have found for the price and ability it is the best I have ever used. And before the Jackery I had the Ravpower 26800 but that one was only 30W USB C PD and didnt have fast charge. Def a good option.
https://www.amazon.com/dp/B0791BGYS3/ref=cm_sw_r_cp_api_.Mm3Bb4FZFZYX
I bought 2 of these since my wife also owns a MBXP. Works great, will charge the MBXP a little over 100% and it will charge it while being on which I know some peer banks don’t have the ability to do.