Welcome to the forum. You came to the right place for motorhome/toterhome builds.
Here is a truck on racingjunk.com that I have been eyeballing for a few months now:
Used 1998 Renegade 13' Toterhome For Sale
it is the only toter I have ever seen with a cargo/storage room and smaller living quarters. It's a great deal for the condition and mileage, but the storage area is a deal killer for me and most others that want this type of truck to live in and pull a race or cargo trailer. may be perfect for you. I saw an ad last week for the same truck reduced to $58k, but I can't find it right now. Give them a call, I'll bet they'll deal, it's been on the lot for a long time. Can't buy a new daully pickup for that kind of money.