Pre travel checklist items

I am getting ready to go from the Charlotte area out west thru Kentucky, Missouri, Nebraska, S Dakota, Wyoming, and Montana to Washington State and return over four or five weeks. Will be staying in Yellowstone for four or five days and in Washington for about ten days. I have a 2013 Keystone Bullet that I bought used and have only stayed in once. Would like to have it gone over without breaking the bank. Have 2 Camping World dealers within 30 minutes. Suggestions!