Drivers License renewal MA

This is the response I received from the RMV the last time I asked:
Dear Mr. ---------:
You only need a Class D license if your vehicle is registered as either
a camper or an autohome, regardless of the vehicle's weight.
You need a CDL license if. . .
- Your camper or autohome is registered as a bus or any other type of
commercial vehicle; and
- It weighs 26,001 lbs. or more.
In this case, see the license class chart in the Driver's Manual to
determine the specific type of CDL license needed.
NOTE: If you want to upgrade to a Class-C license without the passenger
endorsement. . .
1. Get a CDL Manual and study for your General Knowledge Test.
2. Visit an RMV branch and. . .
-Satisfy all the documentation requirements
-Complete the CDL license application
-Pay all applicable fees
-Take the CDL General Knowledge Test, and an endorsement test
for each endorsement you want to add
3. Obtain a Department of Transportation Medical (DOT) Card
4. After passing the permit test and getting a DOT Card, you can upgrade
your license for a $15 fee.
If you want to upgrade to a Class-C license with the passenger
endorsement, or to a Class-A or Class-B license. . .
1. Get a CDL Manual and study for your General Knowledge Test.
2. Visit an RMV branch and. . .
-Satisfy all the documentation requirements
-Complete the CDL license application
-Pay all applicable fees
-Take the CDL General Knowledge Test, and an endorsement test
for each endorsement you want to add
3. After passing the knowledge test, practice driving a commercial
vehicle.
4. Obtain a Department of Transportation Medical (DOT) Card
5. Call the RMV Telephone Center (617-351-4500 or 1-800-858-3926) to
book a road test
6. Pass the road test. If you have pre-paid all the fees, your license
will be mailed to you. If you have not pre-paid, return to the branch to
pay.
Thank you for using www.mass.gov/rmv and have a nice day.
Denise