My husband and I purchased a 1969 Avion truck camper a couple of years ago and have almost completely restored it. Now, I would like to replace the original manual crank jacks with new, electric ones. I would need three. I need help!!! Can the old jacks be replaced with new ones? My husband died last summer and I am ready to travel and camp solo. New electric jacks would greatly facilitate the operation of getting the camper off and on my truck. Any help would be greatly appreciated. Thanks!!!!