These are "stretch" modifications of the stock Type R subsidized merchant into larger and faster ships, assuming that the crew/passenger/bridge section (where most of the complex systems would be) is relatively standard and adding hullmetal and standard engine pods is easy.
Baseline Type R Subsidized Merchant (Classic Traveller, c. 1977). 400
tons. Jump1, 1G. 50 tons fuel.
Model/1. 13 staterooms, 9 low berths.
2 hardpoints. Launch. 200 tons cargo.
Streamlined. 5 crew, 8 passengers, 9 low passengers.
MCr 101.03; 14 months; CER 2.35.
Assumptions on oddsized (500ton) hulls was that an engine pack with a Maneuver/Jump rating of 1 for a 1000ton hull would have a Maneuver/Jump rating of 2 when used in a 500ton hull. They are intended for a TL1112 "pocket empire" where the maximum typical speed is jump2.
The Commercial Efficiency Ratio (CER)
is a relative cost/benefit ratio indicating how well a ship will
perform in commercial service. The higher the CER, the more profitable
the ship will be to operate.
To calculate the CER for a ship: Total the Net Tonnage ("revenue space") of the ship in tons, counting each passenger stateroom as 4 tons, each passenger low berth as 1/2 ton, and cargo tonnage as straight tonnage. (Do not count crew staterooms, sickbay/ emergency low berths, or vehicle bays unless the vehicles are part of the cargo; Net Tonnage is only the part of the ship that can be used to carry passengers and cargo.) Multiply this net tonnage by the Jump number, then divide by the ship's cost in MCr. CER = NetTonnage * JumpNumber / MCr

R2 "Stretched" Subsidized Merchant (TL11). 500 tons.
Jump2, 2G. 120 tons fuel. Model/2. 14 staterooms, 10 low berths.
2 hardpoints. Launch. 240 tons cargo.
Streamlined. 6 crew, 8 passengers, 10 low passengers.
MCr 178.4; 20 months. CER 3.11.
Stretched Subsidized Merchant (Type R2). Using a 500ton hull, the Stretched Merchant is an enlarged, Jump2 version of the Type R Subsidized Merchant. It mounts jump driveE, maneuver driveE, and power plantE, giving a performance of jump2 and 2G acceleration. Fuel tankage for 120 tons supports the power plant and allows one jump2. Adjacent to the bridge is a computer Model/2. There are 14 staterooms and ten low berths. The ship has two hardpoints and two tons allocated to fire control; no weapons are mounted. There is one ship's vehicle: a 20ton launch. Cargo capacity is 240 tons; the cargo hold is plumbed for collapsible and demountable fuel tanks. The hull is streamlined.
The Stretched Merchant requires a crew of six: pilot, navigator, two engineers, medic, and steward. The ship can carry eight high/middle passengers and ten low passengers; maximum lifesupport capacity is 28. The ship costs MCr 116.1 (not counting weapons) and takes 20 months to build at Tech Level 11.
RL "Stretched" Subsidized Merchant (TL9). 600 tons. Jump1, 1G. 80 tons
fuel.
Model/2. 14 staterooms, 10 low berths.
2 hardpoints. Launch. 390 tons cargo.
Streamlined. 6 crew, 8 passengers, 10 low passengers.
MCr 113.0; 22 months. CER 3.47.
Stretched Subsidized Merchant (Type RL). Using a 600ton hull, the Stretched Merchant is an enlarged version of the Type R Subsidized Merchant. It mounts jump driveD, maneuver driveD, and power plantD, giving a performance of jump1 and 1G acceleration. Fuel tankage for 80 tons supports the power plant and allows one jump1. Adjacent to the bridge is a computer Model/2. There are 14 staterooms and ten low berths. The ship has two hardpoints and two tons allocated to fire control; no weapons are mounted. There is one ship's vehicle: a 20ton launch. Cargo capacity is 389 tons; the cargo hold is plumbed for collapsible and demountable fuel tanks and may be subdivided for ship's vehicle bays. The hull is streamlined.
The Stretched Merchant requires a crew of six: pilot, navigator, two engineers, medic, and steward. The ship can carry eight high/middle passengers and ten low passengers; maximum lifesupport capacity is 28. The ship costs MCr 178.4 (not counting weapons) and takes 22 months to build at Tech Level 9.
RL2 "Stretched" Subsidized Merchant (TL11). 600 tons. Jump2, 2G. 140
tons fuel.
Model/2. 14 staterooms, 10 low berths.
2 hardpoints. Launch. 280 tons cargo.
Streamlined. 6 crew, 8 passengers, 10 low passengers.
MCr 227.5; 22 months. CER 3.0
Stretched Subsidized Merchant (Type RL2). Using a 600ton hull, the
Stretched Merchant is an enlarged version of the Type R Subsidized
Merchant. It mounts jump driveG, maneuver driveG, and power plantG,
giving a performance of jump2 and 2G acceleration. Fuel tankage for 140
tons supports the power plant and allows one jump2. Adjacent to the bridge
is a computer Model/2. There are 14 staterooms and ten low berths. The ship
has two hardpoints and two tons allocated to fire control; no weapons are
mounted. There is one ship's vehicle: a 20ton launch. Cargo capacity is 280
tons; the cargo hold is plumbed for collapsible and demountable fuel tanks
and may be subdivided for ship's vehicle bays. The hull is streamlined.
The Stretched Merchant requires a crew of six: pilot, navigator, two engineers, medic, and steward. The ship can carry eight high/middle passengers and ten low passengers; maximum lifesupport capacity is 28. The ship costs MCr 227.5 (not counting weapons) and takes 22 months to build at Tech Level 11.