I'm not sure I understand what you're asking but the rigs I looked at had all of the standard shock and link positions so you could continue with your existing suspension, all of the electrical, fuel, driveshaft and anything else you can think of is stretched as well. By adding the length between the axles there really isn't in change in wheel openings, just their placement. The factory wheelbase is 95.4", the rig shot was listed at 110" on the spec sheet. This may have been due to a slight punch out front with a Currie 3-link and Dana UD44 and the spec sheet does show a 2.5" rear stretch with Wide Open links for a 4-link setup with a retained track bar.