Existing Mobile vs Building from Scratch

[joeslatte]

My friend and I just bought a boxed truck that we want to convert into a mobile business. He has the knowhow. We are contemplating doing this or actually buying one that is already set up and turn key ready. Any suggestions? experiences? We are in the Seattle area- Eastisde of lake Washington.
Thanks
If we do it ourselves- any suggestions for places to get our equipment?