I essentially agree with Eric with an important variable. Split the trusses and connect on site. The major difference is the truss sections do not have to sit on bearing. The truss can be designed to be spliced on site either on the ground or during erection. The truss sections must be designed as one truss and the stresses on the splice addressed. Any truss designer should be able to accommodate this. The assembled truss only needs bearing at the "end" points - in your case 48' ± They can design the truss in multiple sections though this is far more complex but very doable. Have done many times over my career. Think about it - they're not using 48' sticks at the fabricator, they're splicing the chords some where. Anyway it's really not difficult, still easier than stick building with dimensional or TJI and you'll get what you want. Here's a relevant part of an article from Structural Building Components from 10 years ago
Trusses that are too long or too tall for delivery to the jobsite in one piece are designed to be delivered in two or more parts, and then field spliced together on the jobsite. Splicing can be performed on the ground before installation or the Truss sections can be supported by temporary shoring after being hoisted into place and the splices installed from a safe working surface. Temporary Lateral Restraint and Diagonal Bracing must be installed per the recommendations provided
Same principles apply to a horizontal bottom chord
Understand the best way to design a field splice to save time and money.
Field splices provide a means of connecting two truss sections together at the jobsite to create a single larger and/or deeper component. The goal of field splicing is to allow truss manufacturing, shipping and installation greater flexibility in serving customer needs. To successfully use field splices on a project, however, there are a number of issues to consider during the design and installation phase.
Common Materials Used for Field Splices
If connection forces and deflections are low, plywood or oriented strand board (OSB) gussets provide a flexible and cost-effective field splice option. One advantage of using plywood or OSB is that the material can easily be cut to the shape needed. For any field splice, make sure the splice material and its connection to the truss have adequate strength to resist the maximum forces that will transfer through the splice. (See photo: Example of field-spliced scissors trusses.)
Lumber scabs used as field splice material provide an easy option if it is possible to make the splice at a suitable location. Lumber scabs can often be used with high pitch scissors trusses if the splice location can be shifted away from the peak. In these instances, the truss is spliced by applying lumber scabs across the splice joint parallel to the top and bottom chord. The long available lengths and ease of installation make lumber scabs a very effective choice.
Metal plate connected wood scab trusses provide an excellent alternative as field splice material, especially when the forces to be transferred through the splice are very large. Scab trusses are designed to transfer the forces across the splice and should match the profile and configuration of the trusses being connected. Attaching the scab truss(es) to the spliced trusses through the aligning members provides a strong and stable splice connection.
Field splices using steel plates with bolted connections are another possibility, although they are far less common due to the relatively high cost of ordering custom plates. Benefits of using steel plates include the ability to withstand and transfer very high forces and relatively easy installation.
Common Errors with Field Splices: Design Department
A common error when designing trusses that will be spliced in the field is designing each part as an individual truss instead of as a single truss covering the entire span. Designing the trusses as individual parts typically results in truss members and connector plates that are undersized for the loads and forces that will be resisted by the completed field-spliced truss.