In Dec 2006 I entered Laos thru Nakhon Phanom / Thakhek on my Cambo registered DRZ after being refused entry at Nong Khai
Laos 30 visa, 7 day bike permit, 20 day bike insurance, were all issued on arrival at Thakhek.
Bike permit and insurance cost around Bt450
In Vientiane I went to the customs headquarters, 3rd floor and extended the bike permit for another two weeks to equal the insurance duration, no cost.