All of the electronics you mention are DC based. So you want to take the DC power from your truck or TT batteries, convert to 115V AC just so you can convert back to 5V (or maybe 19V for laptop) DC? Well just get
this inverter and use the USB for phones/tables and the double converter method for laptop.
There are plenty of 2.1A 12V to 5V based adapters. Something like
this should work. There are also
DC-DC converts for laptops which are more efficient than DC-AC-DC. They just cost more than an inverter.
Depending on how many devices you want, a portable battery backup may be best.
This one should charge the phones 4+ times or tablet at least once. And
larger capacity options for laptops too.
