I think the default Beaver is probably the best freebie that's ever come with the sim. That said.. I bought the Aerosoft BeaverX (I wanted wheels too)
You can have simulated wheels on the default Beaver if you want. It requires an edit of the aircraft.cfg and it becomes an amphibian, from the cockpit at least. There's no graphics for the mod, so when you look at it from the outside on a runway, it looks like it's floating in the air about a foot off the runway. Otherwise it behaves just like an amphibian. You use the "G" key to raise and lower the gear.
I don't remember the exact line in the contacts that's changed but here's my contact points, just copy & paste with the usual backup precautions
[contact_points]
max_number_of_points = 21
point.0 = 1, 0.8, -4.80, -9.33, 1600, 0, 1.40, 45.0, 0.15, 2.5, 0.80, 4.0, 4.0, 0, 175.0, 175.0
point.1 = 1, 0.8, 4.80, -9.33, 1600, 0, 1.40, 45.0, 0.15, 2.5, 0.80, 4.0, 4.0, 1, 175.0, 175.0
point.2 = 1, -10.55, -4.80, -9.485, 1600, 1, 1.50, 0.0, 0.4, 2.5, 0.80, 4.0, 4.0, 2, 175.0, 175.0
point.3 = 1, -10.55, 4.80, -9.485, 1600, 2, 1.50, 0.0, 0.4, 2.5, 0.80, 4.0, 4.0, 3, 175.0, 175.0
point.4 = 4, 0.00, 4.80, -8.00, 2200, 0, 0, 0.0, 0.0, 2.5, 0.390, 0.0, 0.0, 3, 0, 0
point.5 = 4, 0.00, -4.80, -8.00, 2200, 0, 0, 0.0, 0.5, 2.5, 0.891, 0.0, 0.0, 2, 0, 0
point.6 = 4, -18.10, 4.80, -7.00, 2200, 0, 0, 0.0, 0.5, 2.5, 0.891, 0.0, 0.0, 3, 0, 0
point.7 = 4, -18.10, -4.80, -7.00, 2200, 0, 0, 0.0, 0.5, 2.5, 0.891, 0.0, 0.0, 2, 0, 0
point.8 = 5, -20.10, -4.80, -7.30, 1600, 0, 0, 50.0, 0.0, 0.0, 1.000, 1.0, 1.2, 0, 0, 0
point.9 = 5, -20.10, 4.80, -7.30, 1600, 0, 0, 50.0, 0.0, 0.0, 1.000, 1.1, 1.5, 0, 0, 0
point.10 = 2, -6.90, -25.0, 4.50, 1800, 0, 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 5
point.11 = 2, -6.90 25.0, 4.50, 1800, 0, 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 6
point.12 = 2, -30.23, 0.0, -0.00, 1800, 0, 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9
point.13 = 2, 0.48, 0.0, -2.17, 1800, 0, 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 4
point.14 = 2, -27.50, 0.0, 7.50, 1800, 0, 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 7
gear_system_type=3
static_pitch=3.6 //degrees, pitch when at rest on the ground (+=Up, -=Dn)
static_cg_height=7.4 //feet, altitude of CG when at rest on the ground