Hi Eric -- --
Nice trailer !!
Now -- Any upgrade to replace your 1-Ton ..... Will require a CDL to operate. Why? -- You are pulling a trailer with signage -- Which states a means for compensation.
I have an RV Hauler -- You'r welcome to view the build pictures .... May not be the way you envision to go -- But .. Just one example -- Here's a link to get you started:
http://community.webshots.com/album/49062992VBcrVd/0
As Skip mentioned -- Start with a Class 8 .... Then as time/money allow -- Convert into something like a Showhauler/Renegade.
Good Luck ......
Dave