We do not currently stock the specific Lippert hydraulic hose fittings for Grand Design RV slide-outs and landing gear. However, the recommended fitting is the Lippert 138416 (MFG P/N: [phone removed]16), a straight crimp-on hose end coupling designed for a 1/4" inside diameter hose and a 1/4" Female JIC 37° flare port. An alternative fitting with similar specifications is the Lippert LC249363. These fittings are compatible with Lippert Level-Up hydraulic systems used on Grand Design RVs. It is advisable to carry at least 4-6 of these fittings along with a crimping tool to enable roadside repairs. You may also consider OEM equivalents used by other RV brands with Lippert systems, such as Forest River 40E12155A or Keystone 104113. Pair these fittings with Lippert 3000 PSI hydraulic hoses for best results. Keeping basic tools and spares on hand will help you be proactive and prepared during your travels.