I guess if you got the room. I'm glad I went with a 10lb tank as I usually have passengers with me and the 10lb tank fits nicely with the limited space I do have. A 15 or 20lb tank would be a challenge for me but even if I did have room, I would elect to use a york or similar belt driven compressor and tank to power air tools. A die grinder sucks the CO2 out of a tank fairly quickly.
1998 TJ Moss [COLOR=darkgreen][B][SIZE=3]Green[/SIZE][/B][/COLOR] Sahara w/ numerous scratches & dents whose playground is on a tropical island that's 33 miles long and 4-12 miles wide, in year-round 82 degree weather.
OBA here with a 5 gal tank under the tub for volume of flow. I also carry a 10lb powertank as an emergency back up. i got a great deal on a spare tank, so i keep both filled but carry only one. then when/if a 2ed tank is needed, its already filled and ready to go