Ah, I didn't realize when reading your post that you might be looking for any
lightweight toad alternative.
Here are the 2022 models that are approved by their manufacturer to be flat-towed behind a motorhome without any major modification that are under 3,000 lbs.:
* Chevy Spark, manual transmission FWD - approximate curb weight 2,266 lbs.
* Kia Forte GT Turbo, DCT or manual transmission FWD - approximate curb weight 2,989 lbs.
* Nissan Versa Sedan, manual transmission FWD - approximate curb weight 2,599 lbs.
...and under 3,500 lbs.:
Buick Encore GX, AWD - approximate curb weight 3,258 lbs.
* Chevy Equinox FWD - approximate curb weight 3,274 lbs.
* Chevy Equinox AWD - approximate curb weight 3,465 lb.s
* Chevy Malibu 2.0L FWD auto - approximate curb weight 3,223 lbs.
The above are, again, those vehicles that are approved by their manufacturer to be flat-towed behind a motorhome. There will be instructions in their owner's manuals as to the procedure or at least the manual will mention "recreational towing" and which models are allowed and the general procedures and precautions. FMCA publishes a list every year and for the 2022 models that are manufacturer approved, you can see them in the following link:
2022 FMCA Towing Lineup
(again, factory approved only)
If you are looking for a used vehicle, you can find the FMCA Towing Guides going back to 1999 HERE
There are other that some flat tow that are NOT factory approved but are being successfully towed in certain configurations. You won't see them listed on the FMCA list as they only compile those vehicles that are factory approved. A few lighter vehicles that come to mind are:
Subaru Crosstek AWD, manual transmission
MINI Cooper, FWD manual transmission only
Volkswagen, various models with FWD and manual transmission only