The VW TDI Golf/Wagon is not a "tow truck"... but lets get real.... despite no tow rating there is a GVWR - Gross Vehicle Weight Spec.... The "SPEC" for TDI Golf/Wagon gives about 1150 lbs MAX total payload (GVWR - Empty car weight). I use that as a guide. A Class I hitch is rated to 200 lb hitch load and 2000 trailer gross. You can tow a lot with half that, 1000 lb, a half ton.... what more do you want. It's a compact car... I wouldn't exceed 2000 lb combine total payload, inside car + total trailer weight, and I'd stay in fairly flat lands....
Two people driver/passenger + small 600-800 lb pop-up camper would be a great combo, even with modest gear, you can even tackle some small mountain passes.... Load vehicle up with 4 big adults, full cargo compartment with bags + roof rack + 2000 lb trailer, drive up mountain passes on a hot day...... No. Again compact car, not made for towing, but it can be done within reason and no significant strain on car....
My wagon has 69 cu-ft cargo area. When I have filled the inside of the car, likely near or above the 1000 lb payload limit, the car sits much lower (looks cool), feels fine power wise, but it handles poorly. Taking freeway on-ramps is scary loaded, if you try to drive it like you do solo and empty....
If I ever get a Golf, a hitch will go on it, to go with a small folding utility trailer... Those micro mini T@B teardrop travel trailers interest me, but they are 1700 lbs empty and 160 lb hitch load. I think that is a tad (t@b) too much.