de WA5RMH...
QRP radio? Operating with 5 watts of power or less or 10 watts or less on SSB. Most amateur radio operators run close to 100 watts of power while a group out there run all the way up to 1000 watts. Anything over 5 watts is usually considered QRO, or high power.
For my station, QRO is usually 50 watts or 40 watts, depending on the rig or radio I am using. Most of the time, I am trying to operate QRP at 5 watts with my TenTec 1340, OHR500, or my stealth radio, a FB40/SOP.

My lovely wife is not only a high school teacher, but the author of two mystery novels. We have to do a lot of traveling for autograph sessions, lectures and conventions. While on these trips, I have had some interesting experiences while trying to operate my "mobile" Qrp rigs from parking lots.

I'm in the process of experimenting with different mobile arrangements.
My requirements are:
1) easily carried,
2) easy setup,
3) usable from a veriety of vehicles,
4) one workable antenna,
5) as little equipment as possible.
I plan on using a Valor AB5 80-10 meter mobile vertical for a motorhome later, but right now for the cars, I am trying a 40 meter hamstick with radials, mounted on a surplus heavy duty camera tripod. This has been used both on the ground and set on top of the Suzuki Sidekick or Honda CR-V.