I have my gear at the office, if needed it only makes a day trip to the demo site. Once I pack gear in the car it does add up and become a mess and risk to be stolen.
When it comes to cameras and access gear I use cradlepoint and a small switch clamped to a tripod to demo. All NUCs and VirtualBox servers remain at the office. It is easy to bring an android, iPhone, tablet and laptop to display the clients software.
All camera and local clients are port forwarded back to the office servers. In regards to access card reader I can forward those back to the bench panel as well using SecureLinx. This works for systems that do not have IP based reader or solutions. For instance you can connect your card reader to the Linx in the field and at the office simply hook it up to what ever ACP you are demonstrating, Lenel, Software House, Identiv etc. The Linx is a bit clunky at times but it works and is a smaller form factor than trying to lug around a large suitcase of access panels and an intel NUC.
SecureLinx:
SecureLINX Wiegand Interface Extender System
If you do not want the linx, then a Lenel 2220 works for mercury, IP-ACM for Software House, TS reader for Hirsch, HID EVO for ACS that support Evo. Otherwise you can use the linx.
To make a everything a fast set up you can also use TP-Link Nano routers to reduce cables and provide a wifi connection for your client devices. AP/CLIENT.
If you need a monitor, I use Gator Frameworks Tripod and Suitcase to tote my 42in. 4K around no problem.
Gator Frameworks:
Gator Frameworks Standard Adjustable Tripod LCD/LED TV Monitor stand for Screens up to 48" (GFW-AV-LCD-1)
I would hate to have my stuff stolen, when the car is packed I still worry even when I have to make a pitstop along the way.