Do you mean a National Tradewinds LTC? Usually LLC means a 'limited liability company.' Lift the mattress off the bed and look for latches or access to an engine hatch. Since you refer to engine under the bed, I assume it's a diesel. If you interrupt the fuel flow, as installing an electric fuel pump, you can introduce air into the lines which must be purged before the engine will fire. Please give more information as to engine type, then perhaps people can suggest how to bleed the air out or prime the high pressure fuel pump.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI