I should have driven a shitbox and left the new truck home! Hindsight is 20/20.
You don't want to do this, vehicles are designed to be used and not left sitting in a garage. You'll end up with old oil, dead batteries, stuff not working on the vehicle etc. And you'll be paying for both to be on the road, and you'll have to remember all of the maintenance for both vehicles and it will be taking up space. Just have a single vehicle that does the job best for you.
Just run them up to operating temp once every month or two keeps everything fresh. I have an old plow truck that I added a battery disconnect to because of parasitic drain over time. That's going to get sold one of these days.
I'm a stickler for maintenance. The vehicles that don't get driven a lot never seem to need new parts for years at a time. I get something new to me and I go through it, fix everything that needs it, full tune up with fresh iridiums if the plugs are worn or due per maintenance schedule, oil change w/filter, cabin and air filters, grease the zerks, new fluid in the front and rear diff, transfer, transmission fluid and filter if applicable, power steering fluid, brake fluid if it's dark, coolant if it tests out badly. After all that Inhave established a baseline ... everything is fresh and inspected. It's usually good for a long time until brakes, oil change, air filter need changing ... all easy stuff. If an occasional high dollar repair is needed, it's not a shocker because I don't have any car payments.
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