So what is considered the best jack for general use (wheel changing etc) to carry when trying to keep the weight down. We currently have the van supplied scissor jack but was toying with the idea of a compact trolley jack or maybe even air bags. Looking for long term touring so need to try and keep the weight to a minimum though need to keep function very real! Any ideas / experience? The van is rated at 3.8 currently and we may try to increase that a little if possible later on!