Teacher's Pet - I have added you to the list of existing or former owners of the R-Vision Trail-Lite motorhome. Welcome to the forum and the B+ motorhomes thread. Sounds like you have already done some maintenance chores and an upgrade of the television.
That is one subject that I wish we could reverse. The new digital (over the air) signals have not been kind to us. With an analog signal, we could find a signal anywhere we traveled. Even though it might have been snowy, we could redirect the antennae and improve the signal and enjoy the program. Not true with digital. Have to do a complete scan of all the broadcasts in the area with the antennae pointing in a random direction, then repeat the process tomorrow as we are then in a new area and who knows the correct direction for the antennae.
RV er - I believe you made the right decision to stay with the LT225/75R-16 size. These Trail-lites are so efficiently built (aluminum tubing in walls and ceiling) that more tire is not needed to carry the load. When the tires are 5 to 6 years old, it is time to inspect for dry rot - especially true if the tires are exposed to considerable hot sun. To read the age of the tire, look for a 4 digit code something like ( 2003), which is a date code meaning made in the 20th week of the year 03.
I have clicked on the word "subscribe" above the text of these postings and then can easily find this topic in "My Forums".