And don't forget the portee concept - a truck slightly modified to allow it to carry and use an artillery piece on its bed. This gives the advantage of leaving the gun in its original configuration so that it can be used in the conventional manner but also allowing it to be used from the truck that transports it allowing the gun a modest shoot & scoot ability. The gun on truck combination also has better mobility than a conventional truck with towed gun.
While it's been stated (notably on the wiki page for portee) that the modern terms for such a setup are "gun truck" or "technical", I disagree. The "en portee" concept doesn't have the gun mount permanently fixed to the truck bed as is typically the case gun trucks and technicals.
The concept has been resurrected a few times over the decades with the last one I know of being the M777 Portee from BAE Systems in 2005.
http://www.military-today.com/artillery/m777_portee.htm
This image shows a New Zealand Army Austin K5 truck with an Ordnance QF 6-pounder AT gun in portee configuration as used in the North Africa campaigns of WW2. The website states,
"These vehicles were adapted to serve as platforms for a 6pdr Anti Tank gun in the desert when battles were very fluid affairs moving over considerable distances and the guns were required to be put into action quickly."
Website link
http://www.shoplandcollection.com/he...-k5-gun-portee
Note that in this case, the gun has simply been chained to the bed, some trucks were modified with wheel channels to make loading and unloading the gun easier such as in this picture
The K5 from the first image had a payload of up to 3 tons so the 6-pdr used less than half that capacity leaving enough spare for the crew and a decent ammo load. So even with the weight of a modern artillery piece, the more capable trucks of the 1970s onwards, should be able to handle the portee configuration with ease.