Classic of Brinkman smokers, yours has the charcoal pan, and the water pan, then two racks.
I have the round version, or UDS (Ugly Drum Smoker).
I got the 1500 watt electric element for mine in the last century. Almost never used it, then began using it after I grafted a Bradley Smoke Generator into mine. Bradley pucks became made of gold and only orderable, not available anywhere. So, it was time to change.
I got an MES 30 for what it is, then removed everything but the heater and control, and
added a Mod so the smoke is made outside, and the MES 30 is simply a smoker/oven.
Given your Brinkman, I would still go electric for it's infinite variable heat control, do an
AMNPS for smoke, and enjoy!
If you think you might want to do cold/low temperature smoking, the heating could be as simple as
an electric hot plate, and something like an
Inkbird temperature control.
I chose my Inkbird temperature control so I could use it as a Sous Vide control with a small crock pot, as well as a low temperature control for cold smoking Salmon, and nuts, low temp stuff in my MES 30.
It also runs a fan during the cooling cycle to keep my smoke cooled from my Mod box. I just use a Box fan.
For over 50 years I've done smoking. This MES 30 is the first time I ever bought a "smoker". Then I had to make it work for me.
I have a gas BBQ for that, BBQ'ing. But when smoking, my goal is smoking, not so much an outdoor oven.
Now I can range from cold smoking at overnight lows, up to MES max of 275°, as an outdoor oven.