Here is some titilating news about electric Hybrid Conversions. Go To then click on their Electrocharger Link. I think this will give some insight to those people who want to pollute less, but still need to pull a small camper trailer for weekend outings. The electrocharger is a reasonable alternative to really bad fuel economy. And think about this, what if you could install a drive axle under the triailer and an Electrocharger to that drive axle?