Ashleyz - Congratulations on your purchase. You might already know this, the RVision Trail-Lite motorhome division was sold to Monoco who had or has a subsidiary called Holiday Rambler. They started producing some of the floor plans formerly done by RVision. Check "view profile" and you will see that my cab-over is the same as yours.:)
As to your picture size, you can go back and edit your posting and set the pixel width to 450.
Here is a link to a topic similar to your question
Cleaning & Polishing fiberglass cap over cab using Red Max Pro.